mail coming without MX; how ?

Andrew McNamara andrewm at
Thu Apr 26 02:16:49 EDT 2007

>if you check the domain ""  with  you can
>see no MX for that domain.
>But still mail is coming at user at    we are using it for
>our official purposes and is our official site too.
>I wounder how mail is still coming with out MX ? could any one kindly
>explain ?

Most Mail Transport Agents will fall back to the A record if no MX
records are found. This precident was set by sendmail, and woe betide
any implementation that ignores precident, but it would be foolish to
count on all MTAs behaving this way.

Andrew McNamara, Senior Developer, Object Craft

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