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List:       qmail
Subject:    Re: qmail 421 error
From:       James <qmaillist () kiss-uk ! com>
Date:       2005-08-30 10:29:05
Message-ID: 431434F1.6020408 () kiss-uk ! com
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Julian Grunnell wrote:
> Hi – hoping someone can help me with some deferral / mail delivery 
> failures I’m getting. I’ve recently inherited several qmail servers all 
> used for relaying only. These accept mail via a Foundry Server Iron load 
> balancing device, which in turn gets its requests from a PIX firewall. Thus:
> 
> Recently a few comments have been made that mail is being returned as 
> non deliverable, qmail has given up once its been in the queue too long. 
> An example from the qmail logs is:
> 
> Aug 19 00:42:09 donkey qmail: [ID 748625 mail.info] 1124408529.856721 
> delivery 729645: deferral: 
> Connected_to_194.130.202.93_but_greeting_failed./Remote_host_said:_
> 
> 421_4.0.0_egfirew2_Server_error/
> 
> This error is then repeated through the logs until qmail eventually 
> gives up trying to deliver it.
> I read what the 421 error is referring to but really still no further to 
> understanding why this happening. What confuses me a little more is that 
> if I try the telnet test from another server it works fine, so I know 
> the mail server is up and accepting connections:
> 
> Any help would be appreciated.
> 
>  
> 
> Thanks – J.
> 

Had a very similar problem with an installation a while back. Subscribed
to this mail list just because of the 421 returns but found my solution
as I was formatting my message to the maillist (after several days of
hair pulling).

Check the MTU settings of any routers and firewalls and make sure they 
are set correctly for the environment that they are in. As soon as they 
were corrected at site in question all mails in the queue were delivered
immediately and the site has been without fault ever since.

This may not be your problem but it certainly resolved mine and anything 
I can do to stop people going through the same amount of hairloss as 
myself has got to be a good thing.

Good Luck
James

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