Level 1: Cadet

Email not being piped

I have been piping (redirecting) emails from my "???" address for several years it has suddenly stopped and is being rejected by The service spamhaus doesn't list it as blacklisted. See below.


From: Mail Delivery System <>
Sent: Saturday, 11 January 2020 11:03 AM
Subject: Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

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:
host []
SMTP error from remote mail server after pipelined MAIL
FROM:<> SIZE=6356:
550 5.7.1 Sender domain rejected. IB500



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