Lindsay Haisley writes:

Received-From-MTA data here is always of the form:

    dns; real-domain (domain-literal)

or

    dns; real-domain (real-domain domain-literal)

Under what condition(s) in the courier configuration is this true?  Is
this version-dependent?  Is there a courier config setting under which
this is simply:

It's:

dns; helohost (domain [ip-address])

"helohost" is the domain the sender gives in the sender's SMTP HELO command.

"domain" exists only if the ip-address resolves backwards and forwards.

If the sender's IP address does not have reverse DNS, or if its reverse DNS is some domain that does not resolve back to the same address, the "domain" part does not exist.

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