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What is AWS?
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Check reputation metrics of your AWS account
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Why set Custom MAIL FROM Domain in Amazon SES?
Configure a Custom Domain or Subdomain for Tracking
How to prevent Gmail from showing ‘via amazonses.com’?
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How to resolve AWS Account “Pause” issue?
Achieve positive sender reputation for new domain
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Disable open tracking for all campaigns sent from your Brand
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MailBluster and how it works
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MailBluster support Custom SMTP
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Sending Transactional Emails using MailBluster
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What is a Campaign?
Edit Campaign in MailBluster
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Send quick test email before campaigns
Send Test email using Merge Tags
Configure Double Opt-in in MailBluster
Difference between Standard Campaigns and Automation Campaigns
Send Campaign in plain text in MailBluster
Create and Send an Email Campaign
Send Personalized Email from MailBluster
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Share email campaign from MailBluster
Add Unsubscribe link using Drag and Drop editor
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Email campaign is showing “outdated”
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Resolve Error: “Link/URL used in campaign content must be a maximum of 1000 characters long”
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Use UTM for tracking in MailBluster using Google Analytics
Exceeding the email sending limit in MailBluster and its impact on campaigns
Resolve “Content is invalid, merge tag or block tag contains error”
Resolve “AWS connection is invalid” under the Sender email address
Short preheader text in email campaigns automatically populates
CTA Button URL is Showing 404 Error and Redirecting in Test Mail
Use Default Merge Tag in Email When Data is Missing

Add first name and last name to leads

Last update: September 25, 2025

You can easily add first name and last name to leads in MailBluster, whether you are updating a single lead or multiple leads at once.

For Single Lead (email ID) update:

To add the first name to individual leads, you need to navigate to Leads section and then click on 3 dots (…) ellipses.

Click on the 3 dots ellipses and then Edit lead

Click on the Edit lead, provide the first name/last name, and then click Update lead.

Entering First name and Last name, then clicking Update lead

For Multiple Leads (Email IDs) update:

To add the First name/Last name to multiple leads, you need to create a column inside the CSV File and then add first name and last name to each of the email addresses.

Adding first and last name to CSV file

Then import the CSV file containing the First name/Last name and the Email address with subscription status of the leads.

Click on Import leads

Finally match the first name/last name column of your CSV file to the first name/last name field and Subscribed with Is Subscribed. Email column is automatically matches with Email address field. Be sure to set Update the lead if lead already exists, “Do you want to import the first line of the CSV file” to No. Then click Import file.

Matching the First name, Last name, Email address and Is subscribed

After clicking Import file, lead will be updated as shown below:

Leads import completed successfully

By following these steps, you can add first name and last name to leads quickly, ensuring your email campaigns feel more personalized.

Update individual lead information in MailBluster

Last update: September 25, 2025

To update individual lead information in MailBluster, you need to go Leads section. Then select any lead (email id) by clicking on them.

Updating lead information by selecting any lead by clicking on them

You can also click on the 3 dots and select Edit lead

Clicking the 3 dots and selecting Edit lead

You can update information of the selected lead including those custom fields you have defined from Fields earlier

Updating information of the selected lead having custom fields

After editing the lead, do click Update lead to save the information.

Import leads, subscribers, or email addresses in MailBluster

Last update: September 25, 2025

Importing leads, subscribers, or email addresses to MailBluster is pretty simple. You’ll need a file that supports Comma Separated Values or CSV File format. Make sure your file has two specific columns – for instance, if you have columns labeled “Email” and “Subscribed,” you’ll need to point them to “Email address” and “Is subscribed” before importing them into the Leads section of MailBluster.

In MailBluster, follow these steps to import leads successfully:

1. Just go to Leads > Add new then drag and drop your CSV file.

Clicking on Add new and then dropping CSV file over Add lead

2. After dropping the CSV file, the following structure of the file will be generated just before import confirmation. Highlight the respective field according to the title of the CSV columns.

Highlighting the respective field according to the title of the CSV columns

3. Scroll down and select these options then click Import file:

Selecting Update the lead, No, Yes, and then clicking Import file button

Please Note: If your CSV File has the title “First name, Last name, Email, Subscribed” then you need to select “No” for the option “Do you want to import the first line of the CSV file”.

4. Once imported successfully, you will get the results similar to the one shown below:

After leads imported successfully, Import status is showing Completed

Here is a sample CSV file on Google Sheets with the mandatory columns highlighted for uploading leads to MailBluster. You can follow this format to upload your data to Leads section of MailBluster.

Please Note: The required columns are Email address and Subscribed.

Import leads with tags

Last update: September 25, 2025

To import leads with Tags, first you need to sign in to MailBluster > Brand > Add new > Import leads. Then Drag and drop a CSV file containing Leads with Tags.

Drag and drop the CSV file

The format of the CSV file should be exactly like this as shown below. There should be a column named “Tags” along with First name, Last name, Email and Subscribed.

Correct format of the CSV file

After dragging and dropping the CSV file, match the appropriate fields. Each title column will be same as the first line of their respective column as shown below. Then select the required options. After selecting the required options, click Import file.

After dragging and dropping the CSV file, match the appropriate fields. clink on import file

Once the CSV file imports successfully, it will show “completed” as shown here.

Once the CSV file has been imported successfully, it will show “completed” as shown here. This is how import leads with tags

Now go to Tags of your Brand and you will see the Tags list which are imported from the CSV file. The Tags are already assigned to the Leads from CSV file.

Tags section showing list of Tags assigned to group of leads

Click on any of the tags from the list, and you will see the list of leads that contain the respective tag.

Click on tag and you will see the list of leads that contain the respective tag. This is how import leads with tags

By following these steps, you can successfully import leads with tags in MailBluster and segment your audience for more personalized campaigns.

Assign tags to individual lead

Last update: September 28, 2025

To assign Tags to individual lead, first you need to go to Tags and click on Create new.

Click on Create new to create a tag

Enter the Tag name and Tag description, then click on Create tag.

Click on Create tag button

Here we have created a tag name “Buyers” as an example. The tag shows 0 lead count.

Here we have created a tag name “Buyers” as an example.

If you click on the Tag name Buyers, you will see no leads have been assigned to it.

No leads have been assigned to this newly created tag

Now click on View all and select any lead of your choice.

Click on View all and select any lead of your choice.

Here we selected a sample lead of our choice. Click on the lead.

Click on the lead.

Click on 3 dot ellipsis and then click on Edit lead.

Click on 3 dot ellipsis and then click on Edit lead.

Then click on Tags.

Click on Tags.

Select a single tag or multiple tags to assign to this lead. Here we selected 2 tags to assigned to this lead. Then click on Update lead.

Select a single tag or multiple tags to assign to this lead. Then click on Update lead.

As you can see now 2 tags have been assigned to this lead. One is an old tag (created before) and the other is the new tag we have created just now.

2 tags have been assigned to this lead.

Now go to Tags again and click on the newly created tag.

Go to Tags and click on the newly created tag.

You will now see that the new tag “Buyers” have been assigned to individual lead.

You will now see that the new tag “Buyers” have been assigned to individual lead.

By following these steps, you can efficiently assign tags to individual lead in MailBluster. Using tags effectively allows you to organize your subscribers, segment your audience, and create highly personalized campaigns that drive engagement. Additionally, this method ensures that your email lists remain structured and actionable.

Manage Tags in bulk in MailBluster

Last update: September 28, 2025

If you want to bulk manage tags in MailBluster, you can tag multiple contacts at the same time using two simple methods.

1. Adding tags via import

First go to Tags. Then click on Create new.

Go to Tags and click Create new.

Create a tag by inserting Tag name in the field as shown below. Then add a tag description. Then click on Create tag.

Create a tag by inserting Tag name. Then add a tag description. Then click on Create tag.

Here we created a tag name “Complaint” for example. Now click on the tag.

Here we created a tag name “Complaint” for example.

Once you are inside the tag, click Import.

Once you are inside the tag, click Import.

Then drop a CSV file containing leads as shown below.

Drop a CSV file containing leads as shown below.

Select a CSV file and click open.

Select a CSV file and click open.

Once the CSV file is selected, click Continue.

Once the CSV file is selected, click Continue.

Now highlight the headers according to the fields in the CSV file as shown below. Also set the proper conditions like “Update the lead if lead already exists”. Finally click the Import file button.

Highlight the headers according to the fields in the CSV file as shown below. Also set the proper conditions like “Update the lead if lead already exists”. Click the Import file button.

Your leads will be imported successfully under the tag you have just created.

Leads import status shows Completed.

Now if you click on the Tags, you will notice that it now contains the imported leads. You can click on the tag to see all the imported leads.

Click on the tag to see all the imported leads.

Here is an example of dummy leads imported under Complaint and they are all at unsubscribed state.

Example of dummy leads under the tag.
2. Adding and Managing tags using Bulk action
  • Adding tags

Go to Leads and select any lead that you want to tag by clicking on the checkbox next to their email addresses.

Go to Leads and select any lead that you want to tag by clicking on the checkbox next to their email addresses.

You can also select more contacts by clicking on the drop-down next to the “Email address” header:

You can also select more contacts by clicking on the drop-down next to the "Email address" header.

Now click on the Bulk action and then click Attach tags.

Click on the Bulk action and then click Attach tags.

Attach tags popup window will appear. You can select an already created tag or create a new one as shown below. Here we created a tag name “ComplaintSimulator”.

Select an already created tag or create a new one. Here we created a tag name “ComplaintSimulator.”

Now click on Attach tags. Multiple pre-created tags can also be attached at this time as well before clicking Attach tags.

Click on Attach tags. Multiple pre-created tags can also be attached at this time as well before clicking Attach tags.

Notification like this will appear at the bottom left corner.

Notification like this will appear at the bottom left corner.

Now click on Tags and you will notice that the tag name “ComplaintSimulator” has been created and the Lead count shows the number of leads assigned to this tag. Click on the tag.

Click on Tags and you will notice that the tag name “ComplaintSimulator” has been created and the Lead count shows the number of leads assigned to this tag. Click on the tag.

You will see a list of leads attach to this tag. Here 10 dummy leads has been added to tag name “ComplaintSimulator”.

You will see a list of leads attach to this tag. Here 10 dummy leads has been added to tag name “ComplaintSimulator”.
  • Manage Tags

To manage tags, go to Tags. Select any tag of your choice by clicking on it.

Select any tag of your choice by clicking on it.

You can also select more contacts by clicking on the drop-down next to the “Email address” header.

You can also select more contacts by clicking on the drop-down next to the "Email address" header.

Selecting All will select all 10 tags shown in this page. You use the checkbox to select the specific leads on this page as well.

Selecting All will select all 10 tags shown in this page. You use the checkbox to select the specific leads on this page.

You can also select all the leads assigned to this tag. Here we clicked on Select all 19 leads under this tag.

You can also select all the leads assigned to this tag. Here we clicked on Select all 19 leads under this tag.

Now click on the Bulk action.

Click on the Bulk action.

And, then click Attach tags.

Click on the Attach tags.

Attach tags popup window will appear.

Attach tags popup window will appear.

You can select an already created tag or create a new one. Here we selected a tag name “Buyers”. Then click on Attach tags.

You can select an already created tag or create a new one. Here we selected a tag name “Buyers”. Then click on Attach tags.

You can select multiple tags as well as shown below. This will assign all the leads of this tag to the designated tags.

You can select multiple tags. This will assign all the leads of this tag to the designated tags.

Notification like this will appear at the bottom left corner.

Notification will appear at the bottom left corner.

Now click on Tags and you will notice that the tag name “Buyers” is showing the total number of Lead count assigned to this tag. The leads have been successfully assigned to tag name “Buyers” from “WESTCOAST”.

Click on Tags to check the total number of lead count.

Now click on the tag “WESTCOAST” and then Bulk action > Detach tag.

Click on the tag “WESTCOAST” and then Bulk action > Detach tag.

Bulk Detach tag popup window will appear. You can click on Detach tag again and this will remove all leads from the tag “WESTCOAST”.

Bulk Detach tag popup window appear. edYou can click on Detach tag again and this will remove all leads from the tag “WESTCOAST”.

Notification like this will appear at the bottom left corner.

Notification will appear at the bottom left corner.

Now you will notice, 0 leads are present under the Tag “WESTCOAST”.

0 leads are present under the Tag “WESTCOAST”.

Also, if you click on Tags, you will notice the Lead count of tag “WESTCOAST” is showing 0.

If you click on Tags, you will notice the Lead count of tag “WESTCOAST” is showing 0.

Using tags in bulk helps you segment your audience more effectively. It allows for targeted campaigns, better engagement, and improved deliverability. Therefore, managing tags efficiently can save time and enhance your email marketing results.

Maximum file size of CSV file while importing leads

Last update: September 28, 2025

The CSV file size limit is 10 MB, so you cannot upload a CSV file larger than 10 MB. However, you can work around this limitation by splitting the CSV file using any third-party application and then importing the smaller files to MailBluster Leads.

MailBluster Subscriber Limit

Last update: September 28, 2025

The MailBluster subscriber limit does not exist. You can store unlimited number of subscribers/contacts/email IDs/leads under any Brand in MailBluster. Also, there are no hidden cost or fees to store these leads. You can store unlimited leads or email IDs without any charges i.e. completely free of cost.

The following is a screenshare showing leads/email IDs stored in MailBluster Leads section.

Leads section with unlimited susbcriber limit in MailBluster

Total subscriber count in MailBluster brand

Last update: September 28, 2025

You can easily check the total subscriber count in MailBluster from your brand dashboard. To get the total subscriber count of leads, navigate to your Brand > Leads > View All.

Then, under ‘View All‘, select ‘Subscribed‘. You will notice the Total subscribers count (total number of leads who subscribed to your brand) which will be displayed at the bottom right corner as shown below.

Total subscribers count or total subscribed leads

Total unsubscriber count in MailBluster brand

Last update: September 28, 2025

You can easily check the total unsubscriber count in MailBluster from your brand dashboard. To get the total unsubscriber count of leads, navigate to your Brand > Leads > View All. To get the unsubscriber count of leads in any brand, navigate to your Brand > Leads > View All.

Then, under ‘View All‘, select ‘Unsubscribed‘. You will notice the Total unsubscribers count (total number of leads who unsubscribed from your brand) which will be displayed at the bottom right corner as shown below.

Total unsubscriber count or total unsubscribed leads.

Unsubscribe leads in bulk

Last update: September 28, 2025

To unsubscribe leads in bulk, you need to go to Leads section first, then click on the highlighted checkbox.

Clicking on the highlighted checkbox

After clicking the checkbox, leads on Page 1 will be selected. If you want to select all the leads stored in MailBluster, the click on Select all X leads where X is the total number of leads.

Selecting all 39 leads by clicking the checkboxes

After selecting all the leads, click on Bulk action.

Clicking on Bulk action

Then click on Unsubscribe.

Clicking on Unsubscribe in bulk action

All the leads will then be set to Unsubscribed status.

Leads are all set to Unsubscribed in bulk

Export leads in MailBluster

Last update: September 28, 2025

To export leads from MailBluster, you need to go to Leads section, and click Export all.

Clicking Export all button under Leads section

A popup dialog box will appear showing the email address of the User where the download link will be sent. Click on Export as CSV and you will receive an email on the mentioned email address with the download link.

Clicking Export as CSV button when Export leads popup dialog box appears. Click on Export as CSV and you will receive an email on the mentioned email address with the download link.

Exporting leads allows you to back up your email lists or use them in other platforms. Using this feature ensures your subscriber data is accessible and organized for reporting or migration purposes.

Delete leads in MailBluster

Last update: September 28, 2025

You can delete leads in MailBluster individually or in bulk to manage your subscriber lists efficiently.

Deleting a Lead individually

To delete a single lead from MailBluster, go to Leads, then select any lead by ticking the checkbox. Then click on the 3 dots ellipsis then click on Delete lead.

Selecting a single lead from Leads section, clicking the 3 dot ellipsis and then clicking Delete lead

A popup dialog box will appear for confirmation, click Delete and the lead will be deleted instantly.

Deleting a lead after Delete lead dialog box pops up.

Deleting Selected Leads in Bulk from your Brand

To delete selected leads in Bulk from MailBluster, go to Leads, then select leads by ticking the checkbox.

Selecting multiple leads from Leads section

Then click on the Bulk action. Click on Delete leads.

Clicking Delete leads from Bulk action

A popup dialog box will appear for confirmation, click Delete and the selected leads will be deleted instantly.

Confirming lead delete after Bulk delete leads dialog box pops up.

Deleting All Leads in Bulk from your Brand.

Go to Leads. Then click on the square checkbox shown below.

Go to Leads. Then click on the square checkbox.

Once the checkbox is ticked, click on Select all ‘n number of’ leads button as shown to select all the leads inside the current brand.

Once the checkbox is ticked, click on Select all 'n number of' leads to select all the leads inside the current brand.

Once all leads are selected, click on Bulk action.

Once all leads are selected, click on Bulk action.

Then click on Delete leads.

Click on Delete leads under Bulk action.

A popup dialog box will appear for confirmation, click Delete and all the leads from that brand will be deleted permanently.

A popup dialog box will appear for confirmation, click Delete and all the leads from that brand will be deleted permanently.

Deleting leads individually helps keep your email lists clean and up-to-date. This ensures that your campaigns reach only active and relevant subscribers, improving deliverability and engagement rates.

Does MailBluster allow duplicate leads?

Last update: September 28, 2025

MailBluster does not allow duplicate leads. If a duplicate lead is found, any existing lead information will be updated with the new details or skipped based on the preferences.

Update leads from Google Sheets

Last update: October 5, 2025

If you want to update the existing leads of your brand from Google Sheets, the best way is to import them to your brand. To do so:
1. Download the Sheet as CSV. MailBluster only supports CSV format.
2. Upload it from Leads > Add new > Import leads page.
3. Make sure to enable Update existing leads, otherwise MailBluster will skip importing existing leads.
4. Finally, Import.

Another approach is to use 3rd party applications like Make or Integrately. You can instruct them to read your Google Sheets file and create/update MailBluster leads from it.

Please note: These are 3rd party apps and may charge you for using it.

The last approach requires programming knowledge. Here you need to read the Google Sheets file programmatically and call using MailBluster Developer API to update the lead.

Does MailBluster allow purchased lists of leads from 3rd parties?

Last update: October 5, 2025

MailBluster does not allow sending emails to purchased lists and strongly discourages uploading or importing purchased lists from third parties. You can send marketing emails to subscribed lists and legally collected leads, but not to purchased lists. This is because recipients who don’t recognize your emails are likely to mark them as spam or file complaints, which can lead to your domain being blacklisted. Purchased lists typically have a high complaint rate, and Amazon will promptly block your AWS account as a result. MailBluster strictly adheres to the AWS Acceptable Use Policy, which prohibits using Amazon Simple Email Services (SES) for distributing, publishing, sending, or facilitating unsolicited mass emails, promotions, advertising, or spam.

Please note: MailBluster only supports sending marketing emails to genuine subscribers and subscribed lists. MailBluster does not provide any email addresses or subscriber lists.

Import and update leads with new tags in MailBluster

Last update: October 5, 2025

If you choose to import and update leads with new tags in MailBluster, the existing leads will be updated with the new information. The new tag will be added to the leads, and the existing tags will remain intact. In other words, the new tag will be combined with the existing ones rather than replacing them.

Activity of a lead

Last update: September 29, 2025

You can easily view lead activity in MailBluster to track subscriber interactions. First, go to Leads and search for or select the specific lead. Then, click on the Lead > Activity tab. This will open a tab displaying all the campaign activities for that lead over the last year, as shown below.

Checking the lead activity of an individual lead.

To see the lead’s activity within a specific campaign, click on the Campaign name.

Clicking on the campaign name to see details activities.

The available activity data for individual leads covers the past 12 months.

Ecommerce activity of a lead

Last update: September 29, 2025

To check ecommerce activity of a lead, go to Leads section, then click on any lead. There is an ecommerce tab where it shows detailed information on how many orders have come from this lead or how many products have been purchased by this lead. All these information is displayed in detail in this ecommerce tab as shown below.

Clicking on the Ecommerce tab to see detailed information of orders.

Clicking on any of the ‘order_id_xxxx‘ will let you see all the ecommerce activity details of that specific lead.

Seeing ecommerce activity details of that specific lead.

Import leads to segments

Last update: September 29, 2025

You can import leads to segments in MailBluster, but only into specific types. Standard segments do not allow imports. Instead, you can add leads to A/B testing segments and Static segments.

For A/B Testing Segment

Go to you Brand > Segments and select any A/B testing segment. Notice the type of segment “A/B testing” and click on the segment which you want to import leads to.

Click on the segment which you want to import leads to.

After entering the segment, click on Import.

After entering the segment, click on Import.

Select a CSV File with First Name, Last Name, Email address and Subscribed status. Click Continue.

Drop a CSV File with First Name, Last Name, Email address and Subscribed status. Click Continue

Match the First name, Last name, Email Address and Is subscribed with CSV File information as shown below. Then select the following configurations. Finally click Import file button.

Select the following configurations and click Import file button.

The CSV file containing the leads will be imported successfully as shown below.

CSV file containing the leads imported successfully.

Now go to the A/B testing segment and you will see that your leads are added to that segment.

Go to the A/B testing segment and you will see that your leads are added to that segment.

For Static Segment

Go to you Brand > Segments and select any static segment.

Select any static segment

Notice the type of segment “static” and click on the segment which you want to import leads to.

Click on the segment which you want to import leads to.

After entering the segment, click on Import button.

After entering the segment, click on Import.

Select a CSV File with First Name, Last Name, Email address and Subscribed status. Click Continue.

Select a CSV File with First Name, Last Name, Email address and Subscribed status and click Continue.

Match the First name, Last name, Email Address and Is subscribed with CSV File information as shown below. Then select the following configurations. Finally click Import file button.

Select the following configurations and click Import file button.

The CSV file containing the leads will be imported successfully as shown below.

CSV file containing the leads are imported successfully.

Now go to the static segment and you will see that your leads are added to that segment.

Go to the static segment and you will see that your leads are added to that segment.

Standard segments are dynamic and update automatically based on conditions you set, so you cannot import leads into them.

By using A/B testing and static segments, you can organize your leads better, target your audience more precisely, and achieve reliable campaign results.

Override Lead in MailBluster

Last update: September 29, 2025

The “override lead” feature in MailBluster updates an existing lead with new details when you add it to your brand. This keeps your leads database accurate and up to date.

This information can be found from Your Brand > Add new > Add single lead

Selecting Override lead option will replace the current existing lead information

Deprecated text in MailBluster

Last update: September 29, 2025

In MailBluster, Deprecated text means that in future versions, we may remove this information. This information cannot be used in MailBluster; we only store it. Since we have released the complete lead custom field feature, storing this information is no longer necessary.

deprecated text in MailBluster

Fields and custom fields in MailBluster

Last update: September 29, 2025

In MailBluster, you can personalize email campaigns with Fields and Custom Fields. Fields add default values like a lead’s name or email address. Custom Fields let you define your own tags for storing extra data. You can use both in subject lines, email content, and lead details.

Field

A field is a feature in MailBluster (under MailBluster > Fields) that lets you insert merge tags such as ID, First name, Last name, Full name, and Email address. You can place them in the subject line, body content, and lead information.

The following shows the Fields containing only the default merge tags.

Fields section with default merge tags

Custom Field

A custom field is a feature in MailBluster (under MailBluster > Fields) that allows users to define specific data fields to their unique needs or requirements. These fields are not predefined by the system but are created by users based on their specific use case or context. Custom fields enable users to capture and store additional information beyond the standard or default set of fields provided by MailBluster. It can be used inside subject, email content (email body) and inside every lead information.

The following shows the Custom Fields containing the user defined field tags or custom merge tags.

Fields section with custom merge tags

Create a custom field

Last update: September 29, 2025

To create a Custom Field in MailBluster, go to Fields section and then click on Add new.

Going to fields section and then click on Add new

Enter Field label and then Field merge tag will be auto generated.

Entering Field label

Here we used the Field label “State” and Field merge tag “state” is auto generated instantly.

Using Field label and then Field merge tag is auto generated

Now we can use this custom field “State” in Leads, Standard Segment, Forms and Campaigns quite easily. Here are some examples:

In Add Lead:

Custom Field "State" can be used in Add lead

In Standard Segment:

Custom Field "State" can be used in Standard Segment

In Forms:

Custom Field "State" can be used in Forms

In Subject of Campaigns:

Custom Field "State" can be used in Campaigns

In Edit Content>Compose email under Campaigns:

Custom Field "State" can be used in as Merge Tags

Using custom fields helps you organize subscriber data beyond basic information like name and email. It also allows you to tailor content based on preferences, locations, or other unique attributes.

Maximum character limit of lead field and custom field

Last update: September 29, 2025

The maximum character limit for the lead field is 50 characters.

Custom fields can also be a maximum of 50 characters long. If you change the value to within 50 characters, it will be saved. However, it will not accept values exceeding 50 characters.

Use personalized custom merge tags in MailBluster

Last update: October 5, 2025

MailBluster allows you to create and use custom merge tags in addition to the default ones. These tags can be used in Leads, Email Subject as well as Email Body.

Now with new custom field functionalities, you can import leads, add/update lead, export leads and view leads with custom fields.

You can go to your Brand > Fields and set your own custom field which you can use in you Email Subject and Body.

Setting up your own custom field

Here we added a custom field or merge tag named “Gender.”

Adding a custom field or merge tag named "Gender"

Merge tags can be applied to Subject of the email campaign.

Merge tags can be applied to Subject of the email campaign.

After selecting the merge tag ‘Gender’, it will display like this in the subject line.

The custom merge tag "gender" is added to the Subject of the email campaign.

And, and also inside the Body of the email campaign.

Body of the email containing custom merge tag "gender."

The more custom merge tags you added from Brand > Fields, the more tags will be added here in Merge tags for example: Gender which was added later.

Custom merge tags among other custom merge tags.

The sent email received by the subscriber will be like this:

The sent email received by the subscriber will be like this.

Reasons for no responses despite high open and click rates in MailBluster

Last update: October 5, 2025

Here are three things you need to consider:

1. Increase in Email List Size: Have you experienced a significant growth in your email list? If so, be mindful that privacy features implemented by Email Service Providers (ESPs) might inaccurately track open rates, potentially inflating them. Despite efforts by ESPs to address this, it may still impact your open rate metrics.

2. New Lead Generation Channels: Have you recently introduced new methods for generating leads? If yes, it’s plausible that the quality of leads being generated is lower, thereby contributing to a decline in your click rate.

3. Changes in Subject Lines or Email Copy: Have there been modifications to your subject lines or email content? Such alterations could be influencing your click rate.

By addressing these aspects, you can better understand why engagement metrics are not translating into leads and make informed adjustments to your campaign strategy.