I had a couple of customers using lotus notes ... part of their antispam setup was to verify that the sending mail server had an postmaster account. If it didn't then they rejected the email ... seams a little to much work for an MX server, but they claimed it worked well for them.
That's kind of and "RFC-ignorant" policy, requiring the @sender.domain's MX to accept postmaster. It's SAV, but with the "sender" always being "postmaster".
I've seen similar stupidities.
IMGate does SAV probes using
MAIL FROM:<[EMAIL PROTECTED]>
but the probed MX refuses all mail from postmaster, dumb and RFC-violating, and gave the error text:
"postmaster failed to authenticate" which is a really stupid choice of words, as well as totally incorrect description of what's going on, but what do programmers know about English? :)
Since they don't accept from any postmaster, our SAV, in turn, refuses all their mail because of their unverified (failed) [EMAIL PROTECTED]
Len
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