Because obviously a significant number of people misinterprets the RFC.
More likely, they just have no clue and never read this RFC.
I didn't read the RFC, but I have always used an A record for MX. It just doesn't seem logical to put IP addresses in places other than A records, the idea being that you only need to change the IP address in one place if your IP address changes.
The RFC specifies that 'An MX record may only contain a pointer to a valid A record'. And that's what it must contain.
I agree, but then, there's that old saying "be strict in what you send,
and liberal in what you accept". What harm is being done by looking for
license plates on the roofs?
That doesn't mean you have to accept anything dumb people do. Dumb users
is something you need to cope with, dumb admins is something else.
The police would arrest you. Shame we're not allowed to go and beet these admins with big sticks... Not that I'm encouraging violence of course... :P
Quote from Exim's manual:
It appears that more and more DNS zones are breaking the rules and putting IP addresses on the right hand side of MX records. Exim follows the rules and rejects this, giving an error message that explains the mis-configuration. However, some other MTAs support this practice, so to avoid `Why can't Exim do this?' complaints, "allow_mx_to_ip" exists, in order to enable this heinous activity. It is not recommended, except when you have no other choice.
Bye Racke
With courier you need to add them to esmtproutes and disable BOFHCHECKDNS for that IP. Not tricky, but enough to get people irritated and contact the dumb admins. And when the IP address changes you need to follow, which is why an MX record should point to an A record!
--
Phillip Hutchings
[EMAIL PROTECTED]
http://www.sitharus.com/
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