On Sat, May 21, 2022 at 12:09:37AM -0700, Jeremy Hansen wrote:

> What I experience when the port forward is enabled is suddenly
> “things” out there are attempting to just email random addresses at
> the AWS instance hostname.

You don't have to accept such mail, or if you, you don't have to forward
it to the internal system behind the SSH port forward.  And if
nevertheless you do, you can arrange to not forward it back from the
internal MTA.

> http://skidrowstudios.com/mta/cmx01-logs.txt

Post all relevant data in the body of your message, I am not inclined to
chase them down by switching to a web browser.

Loop breaking is simply a matter of knowing which system is responsible
for final delivery of a given message recipient.

Don't forward mail that for which the input MTA is expected to be the
final destination.

-- 
    Viktor.

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