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From: Wietse Venema (wietseporcupine.org)
Date: Wed Dec 11 2013 - 09:08:14 CST
> long story short, there is a bug in recent Seamonkey builds that emits
> an empty hostname in EHLO on Windows platforms with IPv6, see
> This is extremely hard to debug when a user complains, because while
> Postfix rejects it with 501
> 501 Syntax: EHLO hostname
> it does not log anything at all in the default loglevel
Indeed. The logfile would be useless if Postfix logged ALL crap on
the network. Instead, increase the logging selectively.
In this case you could use smtpd_command_filter to correct such
mistakes. See the first example in
for how to deal with buggy HELO commands.