Mon, 8 Jun 1998 07:54:09 -0400
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I have found that some of these low-frequency error messages
Last error: 551 we do not relay
for hi-volume lists are a result of email addresses RFC821 RCPT TO:<>
that happen to use the lower-preference (higher number) MX RR when that
email address has multiple MX hosts.
Sometimes things are further obfuscated when that email address also
refers to a CNAME record. This seems to "confuse" SENDMAIL anit-relay
configs.
Thus, when a VM/CMS SMTP client is involved, SMTP re-writes the RCPT TO:
address to the CNAME address, and the secondard SENDMAIL gets the
delivery, the above error occurs.
Or so it seems to be from a recent PSID effort.
/Pete
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