From: Wietse Venema (wietseporcupine.org)
Date: Thu Aug 02 2007 - 14:14:45 CDT

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pw:
> Hello,
>
> Postfix appears to be selectively blocking
> only mail sent from google mail servers.
> All other mail appears to be processed normally.
>
> ie: from /var/log/syslog
>
> Aug 2 11:32:12 mail postfix/smtpd[18066]: connect from
> ug-out-1314.google.com[66.249.92.173]
>
> Aug 2 11:37:12 mail postfix/smtpd[18066]: timeout after EHLO from
> ug-out-1314.google.com[66.249.92.173]
>
> Aug 2 11:37:12 mail postfix/smtpd[18066]: disconnect from
> ug-out-1314.google.com[66.249.92.173]
>
>
> This happens for all mail coming from google's servers.
> At first I thought it may have problems with DNS lookups
> so I tried with

If Postfix 2.2 or later, try:

/etc/postfix/main.cf:
    smtpd_discard_ehlo_keyword_maps = pipelining

and report if this makes a difference.

        Wietes

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