> This reminds me (again -- I wrote the same thing on October 11, in
> response to a question) of something I've seen in the finally block
> in org.apache.james.dnsserver.DNSServer.findMXRecords(hostname).
> If the DNS lookup fails to find MX records, then findMXRecords() may
> return simply the hostname from the email address.
See RFC 2821, section 5: "If no MX records are found, but an A RR is found,
the A RR is treated as if it was associated with an implicit MX RR, with a
preference of 0, pointing to that host."
--- Noel
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