Symptoms
Mail forwarding or mailing form on a website hosted in Plesk does not work with the following errors in /var/log/maillog file:
sendmail[16679]: my_popen(): execve(/usr/lib/plesk-9.0/sendmail/sendmail.postfix) failed: Permission denied [13] sendmail[16679]: Unable to execute MTA
sendmail[2118]: Unable to save stdin content to temporary file
sendmail[2120]: cannot create temporary file - (13) Permission denied
Cause
Incorrect permissions/ownerships on the Sendmail binary files.
Resolution
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Connect to the server via SSH.
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Set correct permissions and ownerships for Sendmail binary files:
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on CentOS/RHEL-based distributions:
# chown root:root /usr/lib64/plesk-9.0/sendmail/sendmail.postfix && chmod 755 /usr/lib64/plesk-9.0/sendmail/sendmail.postfix
# chown root:root /usr/lib64/plesk-9.0/postfix-sendmail-wrapper && chmod 4755 /usr/lib64/plesk-9.0/postfix-sendmail-wrapper -
on Debian/Ubuntu-based distributions:
# chown root:root /usr/lib/plesk-9.0/sendmail/sendmail.postfix && chmod 755 /usr/lib/plesk-9.0/sendmail/sendmail.postfix
# chown root:root /usr/lib/plesk-9.0/postfix-sendmail-wrapper && chmod 4755 /usr/lib/plesk-9.0/postfix-sendmail-wrapper
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