From: Wietse Venema (wietseporcupine.org)
Date: Wed Oct 26 2005 - 15:41:59 CDT

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Eric Schoville:
> I am getting a lot of bounces from multiple domains with the above error
> message. I realize that the data response is supposed to be 354, but this
> doesn't solve the problem of mail getting bounced. Is there anything that I
> can do to troubleshoot the problem? This problem is intermittent. Sometimes I
> can send to yahoo.com, sometimes it bounces. Any ideas would be greatly
> appreciated.
>
> My system is running:
> RedHat AS/3
> Postfix 2.2.4
> Amavisd-new 2.3.2

This happens when client and server get out of sync, usually because
some piece of junk "firewall" is messing up the protocol.

You may be able to alleviate the problem by dumbing down Postfix
with

/etc/postfix/main.cf:
    smtp_never_send_ehlo=no

but that means you're going back to the stone age.

        Wietse

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