Multiple CNAMEs - howto?
nobody at isc.org
Sat Oct 28 14:21:42 UTC 2006
> Incoming messages is not a problem - they *should* come to uk1
> primarily, and only to uk2 or 3 if the previous are unavailable.
> For that I have the setup:
> $ORIGIN mailnetwork.co.uk.
> IN MX 10 uk1
> IN MX 20 uk2
> IN MX 30 uk3
> It's for outgoing messages so users can either connect to
> exchange.mailnetwork.co.uk (which will in effect be a round-robin for
> all 3 servers), or directly to uk1, 2 or 3.
> I believe mail clients use the A records for SMTP?
Not all depending on the definiton of "mail clients".
For Postfix and Sendmail I am sure that the use MX before A on outbound
But if we are talking over products like OE I can not say that.
I found this (old) discusion http://www.nber.org/redundant.html .
But I only can say check it.
So check your query logfile.
Even if you would have mutiple A records you should alway's see MX lookup
request for that RR.
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