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From: Wietse Venema (no email)
Date: Tue Aug 09 2005 - 07:34:26 EDT
Adrian von Bidder:
> On Monday 08 August 2005 16.51, Covington, Chris wrote:
> > I also think NXDOMAIN would cause
> > mail from your domain to be rejected by zealous MXes.
>
> How does postfix' SAV (reject_unverified_sender) react to multiple MXen with
> different error scenarious? Will it try to verify the address with just
> one MX and then go 450, or will it retry on lower MXen?
There seems to be a misconception that Postfix always uses SMTP
for address verification.
Instead, Postfix uses the exact same delivery agents as it would
use for normail email delivery. Among others, it uses the exact
same SMTP client, the exact same local delivery agent, and the
exact same pipe or virtual delivery agents.
Thus, you get the exact same MX processing as with regular mail,
the exact same alias expansion, and so on.
Wietse
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