In the syslog I see mails being sent to
[email protected] e.g. from cron, which postfix manages the following:
Feb 18 13:33:02 myserver plesk-sendmail[41385]: S41385: from=<
[email protected]> to=<root>
Feb 18 13:33:02 myserver plesk-sendmail[41386]: S41385: add-from: stderr: PASS...