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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