cannot create temporary file - (13) Permission denied

This is dues to bug in the default installation of qmail in handling local mails... such as mails to root@localhost where the qmail-local binary is not set with the right owner and permissions, as such mails are not able to be written to the spool located at "/usr/local/psa/handlers/spool".

The error in "/usr/local/psa/var/log/maillog" looks like below:

qmail-local-handlers[......]: cannot create temporary file - (13) Permission denied

To resolve, change the owner and permission of /var/qmail/bin/qmail-local to reflect the same as qmail-remote.

cd /var/qmail/bin
chown mhandlers-user:popuser qmail-local
chmod g+s,g-r,o-r qmail-local

Restart qmail:

/etc/init.d/qmail restart

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plesk empty logwatch email

This was also an issue with mails generated via logwatch with empty subject and body.

Error was as below:

handlers_stderr: Error occured during execv(): Permission denied.

Thanks Sandip

Right on the mark. Thank you very much.