On Mon, May 6, 2013 at 1:04 PM, Curt Lundgren <[email protected]> wrote:

> *What I believe is happening here is while the messages are attempting to
> be sent, they timeout before completion (during the DATA command).*
> *
> At this point, I'd recommend that you increase the timeout of the outbound
> SMTP server to allow for the completion of the messages. If the timeout is
> set to 1 minute, increase it to 2 minutes. Increasing the timeout on the
> SMTP server shold help avoid these errors by letting the data section
> complete and not having to wait the retry time and you should see a
> reduction in the amount of 451 errors that are generated."*
>

I'm not much of a postfix admin. I did see some help forums talking about
MTU mismatches. Looks like they cause these type of errors.

http://www.howtoforge.com/forums/showthread.php?t=39635
http://postfix.1071664.n5.nabble.com/Timeout-after-DATA-with-postfix-td18598.html

-- 
Robert Wohlfarth

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