A CORS error occurs when you make a request from an HTML form submission or an AJAX call. This happens because anyone can intercept the request and view the secret API key, which is why CORS restrictions exist.
If you are getting CORS errors, it means you are calling the MailBluster developer API directly from your frontend. Instead, you need to call the MailBluster developer API from your backend.
To resolve this, send the request from your backend using languages like PHP, Node.js, Python, Ruby, etc. You can test this with Postman or a similar API testing tool to ensure it works as expected.
Calling the MailBluster developer API from the frontend will not work due to CORS errors and the associated security risks. Exposing your API key publicly can lead to major security issues.
Always make API calls from your backend to keep your API key secure. This approach will prevent CORS errors and protect your API key from being exposed.