I recently set up ACC within an AWS ec2 instance. Also set up postfix on this which is working. However, when creating a delivery within the ACC console the email delivery is showing as sent but is never received. The relay I set up seems to be working as I am seeing the successful connection within maillog, mta logs and mta child logs. From searching the only clue I have at the moment is the following error in my mta child log:
2020-05-01 18:26:31.603Z 00000FC4 00000FC4 1 info log Starting an MTA child (pid=4036, tid=4036)...
2020-05-01 18:26:35.761Z 00000FC4 00000FC4 1 info log MTA-740014 '<removed email>' sent
2020-05-01 18:26:41.720Z 00000FC4 00000FC4 1 error log IOB-090007 Network error (recv(), errno=2: No such file or directory) (iRc=-61)
2020-05-01 18:28:02.725Z 00000FC4 00000FC4 1 info log MTA-740013 Message(s) waiting: 0, active session(s): 0.
2020-05-01 18:28:02.725Z 00000FC4 00000FC4 1 info log Stopping MTA child (pid=4036, tid=4036)...
I've searched around and can't seem to find solutions by going through my config files or anything online. I can provide more info on my config files if needed.
indicate that the message has been sent successfully assuming this is the email you sent the email to.
Now there are in broad 2 reasons for an email not reaching the user.
1. Landing in spam / junk folder - have you ruled this out that the email is not in spam
2. Can be blocked by ISP/ Mail provider / Spam filters - If this is an internal org domain try with a public domain like gmail.com or hotmail.com and if you get the email on them , check with IT to see if communications from the relay server are getting blocked.