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Re: 4xx SMTP Messages and Backup MX Usage
From: Wietse Venema (wietse
porcupine.org)
Date: Sat Oct 23 2004 - 13:48:43 CDT
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Matt Jeanneret:
> Hello,
>
> I am attempting to send email to a domain that has two MX records. I am
> using Postfix 2.1.5. The primary MX host responds with a "421 SMTP
> service not available, closing transmission channel" and the secondary
> MX host is never attempted. The message stays in the queue until it is
> bounced back to the sender.
You did not tell us that Postfix gives up after TWO attempts. The
primary for fedex.com has two IP addresses.
Sites that list a primary that never accepts mail should fire their
IT staff.
Wietse
smtp_mx_session_limit (default: 2)
The maximal number of SMTP sessions per delivery request
before giving up or delivering to a fall-back relay host,
or zero (no limit). This restriction ignores IP addresses
that fail to complete the SMTP initial handshake.
This feature is available in Postfix 2.1 and later.
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