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Re: One MX with multiple addresses vs. several MXes

From: Bernhard Schmidt (bernibirkenwald.de)
Date: Sun Oct 07 2007 - 15:16:30 CDT

On Sun, Oct 07, 2007 at 05:11:33PM -0300, Reinaldo Carvalho wrote:

Hello Reinaldo,

[ a) = two MX records with an address each ]

> Tha option a) is necessary to avoid greylist delaies, because all of
> MXs will be utilized on the first deliver.

Our greylisting servers are centralized and share a common database, so
that would not be an issue I guess.

However, this means the sending MTA does not retry on another address if
it receives a temporary reject? Is that true for all 4xx codes or only
for a subset? I'm thinking about rejects caused by misconfigurations
(the "Server configuration error") for example.

Thanks,
Bernhard