Specifically, I have a dyndns host, kam.is-a-geek.com and I want to
see if sendmail allowed the relay because of an entry in the access
file, e.g.:

kam.is-a-geek.com    RELAY
The above access entry for dyndns *WILL NOT* work -
it requires "closed PTR-A" loop to be effective.
[ I have checked there is no such "closed loop" ]

What do you want to achieve?

I want to allow a machine at my house on a dynamic IP to relay off my sendmail server.

So far from my testing, it appears to be working as I wanted which is that sendmail will allow the relay because the forward record matches the IP of the machine trying to relay.

Regards,
KAM
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