Fixed Enabling DKIM stops list-unsubscribe headers being added to emails

[Mart]

Affected version

2.3.7

I've had a long-standing issue with list-unsubscribe headers not appearing on my Production site but I'm having to migrate servers so I've used the opportunity to troubleshoot on the new setup and I believe enabling XenForo to sign emails with DKIM stops the headers appearing. Is that expected behaviour? I've done a lot of searching/research and it doesn't appear to be expected.

Testing:

PHP built-in email system (server set up with Postfix)
Email options set to yes (with unsubscribe email address populated)

• Send unsubscribe requests via HTTP
• Send unsubscribe requests via email

Sending email with the Communication > Email users option

(Not sure if the screenshots are useful but I went to the effort of obfuscating them so here they are)

Before DKIM: I can see list-unsubscribe headers in the signature and message headers

Spoiler

After successfully enabling DKIM in XenForo: no list-unsubscribe headers

Spoiler

I'm happy to troubleshoot and provide more info if useful but wanted to check if it's an issue or if I've missed something. Thanks!

 

[XF Bug Bot]

Thank you for reporting this issue, it has now been resolved. We are aiming to include any changes that have been made in a future XF release (2.3.8).

Change log:

Fix DKIM signing preventing List-Unsubscribe headers from being added to emails

There may be a delay before changes are rolled out to the XenForo Community.