MailBluster has Custom Merge Tags that 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](https://mailbluster.com/wp-content/uploads/2022/07/unnamed.gif)
Here we added a custom field or merge tag named “Gender”
![Adding a custom field or merge tag named "Gender"](https://mailbluster.com/wp-content/uploads/2023/12/merge-tags.png)
Merge tags can be applied to Subject of the email campaign
![Merge tags can be applied to Subject of the email campaign](https://mailbluster.com/wp-content/uploads/2023/12/merge-tag.png)
![custom merge tag "gender" is added to the Subject of the email campaign](https://mailbluster.com/wp-content/uploads/2024/02/merge-tags-02-1.png)
And, Body of the email campaign as well
![Body of the email containing custom merge tag"gender"](https://mailbluster.com/wp-content/uploads/2024/02/merge-tags-03-1.png)
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](https://mailbluster.com/wp-content/uploads/2023/12/merge-tags-04.png)
The sent email received by the subscriber will be like this:
![The sent email received by the subscriber will be like this](https://mailbluster.com/wp-content/uploads/2024/02/merge-tags-05.png)