I need to make some entries in whilist_from_rcvd. But the only hostnames in the Received: header that I can trust, are not resolveable. Does that matter?
Yes it matters.. SA only looks at the RDNS portion of the Received: header. It will NOT honor a text string in any other part of the received header, since those are easily forged by doing a forged HELO.
Is it a simple pattern/string match, or does SA also try to resolve the hostname?
SA doesn't try to resolve the hostname, it relies on the MTA to do that.
Like this:
whitelist_from_rcvd [EMAIL PROTECTED] NTDOMAIN.private.dns
Should that work?
No, not unless your MTA can resolve an IP to NTDOMAIN.private.dns and put it into a Received: header.
NTDOMAIN.private.dns does not need to forward resolve, but the IP does need to RDNS to that.
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