Resolved Can't receive emails (Plesk 17.5.3, Ubuntu 16.04)

[ChristianAberle]

Hello,

I'm using Postfix (Qmail doesn't work at all) and Courir (Dovecot works sporadically), actually I changed it several times because the first couple mins eitehr seinding or receiving works for maybe 3 emails receiving and sending maybe 1 or 2.

At present I can send emails but can't receive. Yahoo shows following error:

This is the mail system at host xxxx.xxx.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<test1@xxx.com>: unknown user: "test1"

No users can be found anymore for any email address. Repairing the mailboxes failed (no errors). What else can I do?

Thanks
Christian

@admin: Could you please transfer this post to Plesk Onyx, thank you.

 

[UFHH01]

Hi ChristianAberle,

could you pls. check, if the following KB - article might solve your issue?

=> Cannot send message: unknown user​

For further investigations, pls. incl. you mail - log and the corresponding mail - server configuration files.

=> Plesk for Linux services logs and configuration files ( KB - article: 213403509 )​

 

[ChristianAberle]

Only receiving now doesn't work at all from Yahoo (no blacklist, all spam arrives from time to time).

Update: Now the emails arrive!

Thank you for helping.