Posted by "Michael Sims" on 09/21/05 22:22

Jim Moseby wrote:
>> There's no requirement for an MX-record, so you'd need to check the
>> A-record ($domain) too.
>
> Excellent answer. No requirement for MX record?
>
> [showing my ignorance]
> How does email routing happen if there is no mail exchanger in the
> zonefile for a particular domain?
> [/ignorance]

Most all mail transfer agents will fall back to looking for an A record if an MX
record doesn't exist. It's good practice to define an MX record but it isn't
required...

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