Chaining MX records illegal?

Barry Margolin barmar at
Thu Nov 10 06:12:20 UTC 2005

In article <dku9b6$20ih$1 at>,
 Chris De Young <chd at> wrote:

> Hi,
> Am I correct in my interpretation that chaining together MX records is 
> illegal,
> despite the fact that it seems to mostly work?
> For example:
>	mx 10
> .
> .
> .
>	mx 10
> is a no-no?

There's nothing invalid about it, but it won't do what I think you 
expect it to do.  Mail for will be delivered to, not  After looking up an MX record, the 
sending system will then look up the A record of the name it gets, it 
shouldn't look for an MX record of it.

Barry Margolin, barmar at
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

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