Chaining MX records illegal?
barmar at alum.mit.edu
Thu Nov 10 06:12:20 UTC 2005
In article <dku9b6$20ih$1 at sf1.isc.org>,
Chris De Young <chd at arizona.edu> wrote:
> Am I correct in my interpretation that chaining together MX records is
> despite the fact that it seems to mostly work?
> For example:
> chud.net mx 10 mail.foobar.com.
> mail.foobar.com mx 10 smtp.yahoo.com.
> 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 chud.net will be delivered to
mail.foobar.com, not smtp.yahoo.com. 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 alum.mit.edu
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