MX pointing to an IP address
Jim Reid
jim at rfc1035.com
Sun Jan 14 16:53:26 UTC 2001
>>>>> "Frank" == Frank Krychek <jojo at intnet.mu> writes:
Frank> Is it legal to have an MX record that points to an IP
Frank> address instead of to a hostname i.e
Frank> hostb IN MX 204.5.6.7
No. Read RFC1035 on the syntax of MX records. You've missed the
preference value in the record's rdata. And the final element of the
rdata is a hostname, not a dotted decimal IP addrres. That hostname
must exist as an A record.
Frank> What potential problems could this lead to?
Undeliverable mail. DNS errors at load time, leading to lame servers
and failing zone transfers.
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