I have a user that i have included to the whitelist (bypassed antispam rule) and I also added a keyword so email from a firstname.lastname@example.org will go through.
The email to through but the user from aol is getting an error message " 451 4.4.1 reply: read error from mail.mydomain.com.
<email@example.com>... Deferred: Connection timed out with mail.mydomain.com.
Message could not be delivered for 3 hours
Message will be deleted from queue"
Any suggestions on what should I do to prevent that user from getting that returned email message?