Just recently I started having email bounce back when sent to the Shaw
email server (shawmail.cg.shawcable.net[188.8.131.52]:25).
I am using postfix on a Linux computer to forward local system email
through my Shaw internet connection and the Shaw server, to my personal
Shaw email account. This was working fine for many years, but on or
around April 22, 2015, it stopped working. The error message indicates
that the locally defined domain in the "from" address was rejected.
Before this date, the emails were accepted and delivered by the Shaw
Has Shaw changed something in their email servers to no longer support
relaying email when the "from" address is a locally defined domain?