I have the exact same bug already posted here: https://wordpress.org/support/topic/gravity-forms-multipart-message/
First of all, thanks for a great plugin. Recently, I started improving the email-deliverability of my Gravity Forms notifications. One of the improvements is to make use of a multipart message format. For that, I make use of the “4. Change the message format” at https://docs.gravityforms.com/gform_notification/ documentation. I use that piece of code to change it to “multipart”. The code works fine and will sent the notification as a multipart message. The only problem is that the email_boundary code 394c21ef2c7143749256c37c3b5b7ee0, which i did find in the plugin files “gravityforms/common.php”, is added to the content of the email body on the bottom. It is visible when you read the message in a mail client. That email boundary code should only be in the email header.
This email_boundary code is only added when I make use of the POST SMTP plugin and does not happen when I disable this plugin.
Is there some kind of conflict/bug between those plugins? Any idea what causes the problem? Or is this something that cannot be fixed? Thanks a lot.
Is there anyway to fix this?
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