On 02.02.2024 at 01:52 Hugh E Cruickshank via mailop wrote
> We are experiencing a problem with mail delivery to Shaw.ca. Since January 
> 18th messages have been bounced with: 552 5.2.0 Message contains bare CR and 
> is violating 822.bis section 2.3. We have tried to contact postmas...@shaw.ca 
> but have not received any response yet. I was wondering if there was anyone 
> on this list who could provide a support contact at shaw.ca that might be 
> able assist us with identifying and correcting this issue.
> Any suggestions would be greatly appreciated.

Does the message contain a bare carriage return? If so you don't need to 
contact anyone, because the message is syntactically broken and needs to be 
fixed:
https://www.rfc-editor.org/rfc/rfc2822#section-2.3
> CR and LF MUST only occur together as CRLF; they MUST NOT appear 
> independently in the body.

Depending on your MTA you can enable debug logs or redirect/duplicate the 
message into a local mailbox to check its body.
Maybe you can also configure your MTA so that it does not accept such messages 
in the first place and is then stuck with them.

--
BR Oliver
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