From: Bernhard Schmidt (bernibirkenwald.de)
Date: Sun Oct 07 2007 - 15:01:51 CDT

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Hello everyone,

apologies for being slightly off-topic. We are currently replacing an
old commercial software MX cluster with Postfix based boxes for the
pubic-facing side of an university network (which has a few hundred
domains inside). Both new servers are running fine for a number of
selected destinations so far.

We started to think how to configure DNS for the new system and are
basically stuck between two options

a)

doma.in IN MX 100 relay1.doma.in.
                IN MX 100 relay2.doma.in.

relay1.doma.in IN A 1.2.3.4
                IN AAAA 2001:db8::1

relay2.doma.in IN A 1.2.3.5
                IN AAAA 2001:db8::2

b)

doma.in IN MX 100 relay.doma.in.

relay.doma.in IN A 1.2.3.4
                IN A 1.2.3.5
                IN AAAA 2001:db8::1
                IN AAAA 2001:db8::2

Clear advantage of option b) would be to be able to scale just by adding
a new box and list its addresses, while with option a) we would need to
touch the MX records of every domain pointing to those systems (which
might not even be in our control).

Are there any disadvantages of scheme b)? Does the behaviour of the
sending server (both postfix and all other MTAs) differ between those
configurations?

Thanks in advance,
Bernhard

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