Issue Incoming & Outgoing suddenly not working (but *some* emails coming in?)

[caryatnid]

Hi there. I'm a n00b. I'm using Plesk Obsidian 18.0.32.

I have different customers/domains. On one domain, the webmail is suddenly (since yesterday) unable to send/receive emails *most of the time*.

I've tried to send an email from the account - it goes to the sent folder, with no error message, however it doesn't get to the recipient (I've checked Junk). Likewise, I've tried to send an email to this inbox - it looks sent from my end, but doesn't arrive. However, strangely, the inbox *is* able to receive some emails - e.g. it seems to be still receiving spam emails and Newsletter emails (e.g. an ASOS email was received).

Nothing was changed (that I can see) between the emails working & not. The emails have been working fine for about two months (since it was on Plesk). I'm checking the emails on webmail - i.e. to eliminate issues that Outlook/phone mail etc. may be causing.

Please, can anyone help me figure this out?

Many thanks,
Caryatnid

 

[IgorG]

In case of any problems with mail, you need to start the investigation by examining the entries in the mail log (/var/log/maillog) and the webmail log (in case of Horde it is /var/log/psa-horde/psa-horde.log and for Roundcube it is /var/log/plesk-roundcube/errors)
Try to find there records of errors related to the problem.