This bell.net problem (also on its related sympatico.ca domain)
doesn't seem to have a solution. Many have tried ...
My workaround (for opensmtpd) is this:
filter bellnet phase mail-from match rdns regex "\.bell\.net$" \
reject "550 5.7.1 bell.net does not accept mail from orthanc.ca, so we
don't accept theirs."
filter bellnet2 phase mail-from match mail-from regex "@(.*\.)?bell\.net$" \
reject "550 5.7.1 bell.net does not accept mail from orthanc.ca, so we
don't accept theirs."
Using this, when bell.net or sympatico.ca customers try to email
me, they get a DSN explaining what's going on. Otherwise, it
appears they are being ignored or ghosted, as I am unable to
reply to their mail. And likewise you need to block mail sent
to bell.net hosted domains with a similar DSN so your senders
know what's going on.
That workaround has been implemented by a lot of sites.
The bottom line is bell.net doesn't understand how email works,
and they have no interest in learning. Because they already
Know It All :-P
--lyndon
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