Due to a misconfigured 'out-of-office' responder (yuk) that one of my clients set up, I note that there may be an issue with the Mailer-Daemon@pih-relay04.plus.net email address.
Sending a mail to this address gives the following error:
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A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: radmin@pih-relay04.plus.net (ultimately generated from Mailer-Daemon@pih-relay04.plus.net) Permission denied: creating lock file hitching post /var/mail/radmin.lock.pih-relay04.plus.net.46e786b2.00002f11 (euid=1000 egid=102): retry timeout exceeded
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I was always under the impression that the Mailer-Daemon aliases simply blackholed inbound mail?
B.