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Hi, Great plugin. I currently have it connected to Mailgun via the API method and I ran into a weird issue.
I’m trying to add the List-Unsubscribe header to messages my plugin is sending out and my test emails were reaching my gmail box with the value blank. e.g.:
List-Unsubscribe:
I checked the PHPMailer output and the header was correct. After opening a ticket to Mailgun to find out if the problem is on their end, I decided to try changing WP Mail SMTP to use the SMTP method against the Mailgun sandbox. This time the header arrived intact.
Not sure if it’s a bug with WP Mail SMTP’s Mailgun API feature or if it’s a problem over at Mailgun. It’d be great to get to the bottom of this.
Thanks,
Vinny