From: Wietse Venema (no email)
Date: Sat Aug 06 2005 - 15:56:01 EDT
A large, but decreasing, portion of mail is from non-standard mail
engines. A non-functional primary MX record is something I had not
thought of.
If you're concerned about listing a primary MX record without valid
A record, you could instead supply an IP address that immediately
returns a TCP RESET. This could be done with a packet filter rule,
or by giving a machine a second external IP address without an SMTP
listener on it.
Wietse
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