Resolved Why is one email of a domain not working, if others are?

[Change Maker]

Server operating system version

Ubuntu 22.04.4 LTS

Plesk version and microupdate number

Version 18.0.60 Update #1

I'm hosted on Ionos with Plesk and my sites run as an external website.
So this means my emails are on my Server of course.
However, on Monday, I stopped receiving emails on one account but not the others of the same domain.
I checked my DNS entries and I hadn't changed anything.
I've now deleted and re-created the account back on the server in case there was some kind of corruption of the account.
On the Plesk Panel, we are able to see test messages sent from other email addresses, but they don't reach

Does anyone else have any ideas?
Here's one test email from the logs that was sent and never arrived

Jul 24 22:32:35 EA17E80139: client=localhost[::1], sasl_method=PLAIN, sasl_username=[email protected]
Jul 24 22:32:35 EA17E80139: from=<[email protected]> to=<user@example.com>
Jul 24 22:32:35 EA17E80139: grey: stderr: SKIP
Jul 24 22:32:36 EA17E80139: message-id=<[email protected]>
Jul 24 22:32:36 EA17E80139: check-quota: stderr: SKIP
Jul 24 22:32:36 EA17E80139: spf: stderr: PASS
Jul 24 22:32:36 EA17E80139: dk_sign: stderr: PASS
Jul 24 22:32:36 EA17E80139: from=<[email protected]>, size=1241, nrcpt=1 (queue active)
Jul 24 22:32:36 EA17E80139: from=<example.co.uk>, to=<user[email protected]>, dirname=/var/qmail/mailnames
Jul 24 22:32:36 EA17E80139: DKIM verification (d=example.co.uk, 0-bit key) failed: key DNS query failed
Jul 24 22:32:36 EA17E80139: dk_check: stderr: PASS
Jul 24 22:32:36 EA17E80139: dmarc: stderr: PASS
Jul 24 22:32:40 EA17E80139: spam: stderr: PASS
Jul 24 22:32:40 EA17E80139: arc-sign: stderr: PASS
Jul 24 22:32:40 EA17E80139: to=<user@example.com>, relay=plesk_virtual, delay=4.7, delays=0.17/0.01/0/4.5, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Jul 24 22:32:40 EA17E80139: removed

 

[scsa20]

Are you using webmail or an email client? If email client, are you using POP or IMAP? If you're using webmail, check if you have a mail client configured that's popping it but not keeping a copy on the mail server. Otherwise we need to see more logs, use the log browser with real time monitoring enabled searching for the email address in question and send an email to it to see what the logs show.

 

[Change Maker]

Thanks. It was Webmail.
An update was that last night I deleted my email account on the server and re-created it.
It now is working as it should. Perhaps something for us all to remember as something to try, if we're not going to lose emails we want to keep.
I pull mine down to Zoho, so I had the emails I wanted to keep.

Thanks for engaging.