Resolved plesk sendmail does not work

[Kulturmensch]

Server operating system version

Ubuntu 20.04.5 LTS

Plesk version and microupdate number

Plesk Obsidian v18.0.49

Suddenly I receive new error messages in var/log/mail.err

h2828820 postfix/sendmail[7558]: fatal: open /etc/postfix/main.cf: Permission denied
Feb 1 21:13:00 h2821220 plesk-sendmail[7557]: S7546: sendmail unsuccessfully finished with exitcode 75
Feb 1 21:13:00 h2821220 postfix-local[7546]: D3B5E140076: Unable to send message. sendmail status: 75
Feb 1 21:13:00 h2821220 postfix-local[7546]: D3B5E140076: Unable to send mail for: <internal E-Mail address>

The internal forwarding of E-Mails does not work and sending of Plesk-messages does also not work.
Any idea?

 

[scsa20]

More likely a permission issue. Please run the following command via SSH

chmod 755 /etc/postfix

See if that works.

 

[Kulturmensch]

Was the problem! Looking for a solution last night I found a 2nd issue. After server restart and #postfix check there were a differenc between

1. etc/resolv.conf =>
...
nameserver 127.0.0.1
nameserver 127.0.0.53

and
2. /var/spool/postfix/etc/resolv.conf
...
nameserver 127.0.0.1nameserver 127.0.0.53

I also fixed 2.

Not sure whether these both issues belongs together.

However, now forwarding works again. Thank you!

 

[scsa20]

Good to hear that it's working again. I went ahead and marked the thread as resolved.