On Saturday 29 August 2009 15:32:44 Thanachit Vichianchay wrote:
> sorry,
> I mean
>
> mydomain.ac.xx     smtp:[10.100.100.101]:25
> mydomain.ac.xx    smtp:[10.100.100.102]:25

Try it, you will see that it does not work.

I would suggest setting a MX record and using that:

mymx.mydomain.ac.xx.            MX      10 host1.mydomain.ac.xx.
mymx.mydomain.ac.xx.            MX      20 host2.mydomain.ac.xx.
host1.mydomain.ac.xx.           A       10.100.100.101
host2.mydomain.ac.xx.           A       10.100.100.102

then in transport_maps :
mydomain.ac.xx          smtp:mymx.mydomain.ac.xx

Set equal priorities if you want both hosts to be used more or less
equally.

The same DNS-based solution could be extended to avoid the use of
transport_maps altogether. Simply set the MX for mydomain.ac.xx. in a
private view for the mail server. BIND named(8) has "view" features
which do this. A simpler means of overriding global DNS for a host
can be had using dnsmasq(8).
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