Issue Emails being sent but not received

[Bratcher]

Server operating system version

Ubuntu

Plesk version and microupdate number

Linux Version Plesk Obsidian Web Host Edition Version 18.0.46

Using Plesk Obsidian vps: Settings seem to be correct. Receiving email with no problem. SMTP green lighted and sent. DNS settings green.
However, none of the emails from the domain are being received. Not one of multiple emails.
Have tried many configurations on Plesk mail services but nothing changes.

 

[IgorG]

Any related errors in Plesk maillog?

 

[Bratcher]

No that's the puzzler. At first, I was getting undeliverable messages back but now nothing the emails aren't delivered and just seem to disappear after being sent successfully.

 

[Maarten]

Are there emails left in the mail queue?

# mailq

 

[Bratcher]

Messages in queue: 68 deferred, 0 held, 0 incoming, 0 active, 0 corrupted, 68 total.
incoming and outgoing

 

[Maarten]

Do you see the reason why the mail server can't send the deferred emails? I.e., a connection timeout?

 

[Bratcher]

No I don't see any reasons. But it might be a timeout as support has mentioned this.

 

[Maarten]

If it was a timeout, you should see something like this in the mail queue:

-Queue ID-  --Size-- ----Arrival Time---- -Sender/Recipient-------
EC4D438AA57      429 Fri Jun 25 07:54:19 info@domain.com
(connect to email-smtp.us-west-2.amazonaws.com[xxx.xxx.xxx.xxx]:587: Connection timed out)
                                         contact@domain.com

Is the mail server running at all?

# systemctl status postfix