From: Peter Rabbitson (rabbitrabbit.us)
Date: Wed Aug 01 2007 - 10:57:23 CDT

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Hello,

This is yet another not strictly postfix related post, please bear with me.
My question is simple - is it legal/will it cause any problems if a
domain lists two MX records which eventually resolve to the same IP.

Here is the rationale: I need to migrate an MX used as backup for many
domains to a different IP. The IP will be released into a pool, and
possibly reused promptly. If it is assigned to another SMTP server mail
might be returned due to the 5xx responses such a server might produce.
One way to deal with that would be to change the MX information for all
domains, but it will take quite some effort. Another would be to simply
change the A record of the MX in question until everything is settled
(all domains list the same MX fqdn).

Thank you for your help!

Peter

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