On Mon, 12 Feb 2018 15:16:56 -0500
"Farokh - Best Tech Service, LLC" <far...@besttechsvc.com> wrote:

> Hi, I sent the message below back on January 22, but didn't see any 
> responses, so I'm sending it again, since I'm seeing the error more 
> frequently.
> Any pointers would be appreciated.
> Thanks!
> I have someone trying to send me email and ASSP is rejecting the
> email with:
> '550 5.0.350 Remote server returned an error -> 502 AUTH not
> supported'

Need more information. What are your settings? Do you have TLS/SSL
enabled? Are you requiring SSL/TLS for auth? (AUTHrequireTLS) May need
to check the versions of SSL you are supporting.

I would crank up logging, to verbose/debug, for connection, verify,
user validation and any others that make sense. Really cannot have to
much output from the problematic sender. Usually the logs will
tell/show you what the problem is in more detail.

Really need a lot more information both on your config, and log of what
is happening when the email is rejected/denied.

William L. Thomson Jr.

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