From: Sandy Drobic (postfix-usersjapantest.homelinux.com)
Date: Wed Aug 16 2006 - 15:35:48 CDT

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Jeff Honey wrote:
> I have a particular set of destination mail servers (seems like mostly
> Exchange) that dump my outbound mail conversations:
>
> <snip> Aug 16 13:31:38 mail postfix/qmgr[28111]: 9B10C2DE:
> to=<someonesomewhere.com>, relay=none, delay=433610, dsn=4.4.2,
> status=deferred (delivery temporarily suspended: lost connection with
> some.mail.host[10.11.12.13] while receiving the initial SMTP greeting)
> </snip>
>
> Postfix seems to be dutifully following accepted practice and simply
> deferring the message. When I manually connect to the destination
> server, I HELO just fine but if I EHLO, I get unceremoniously dumped
> with no message, no warning. As I understand it RFC-compliant greetings
> are:
>
> HELO<sp>domain<cr><lf> Or EHLO<sp>domain<cr><lf>
>
> ...if I EHLO with no domain I get a simple 502 response and stay
> connected. Strange stuff! My questions of the day are:
>
> 1 - does postfix EHLO with domain or without? 2 - can I force postfix
> to HELO instead of EHLO to a particular destintation
>
> Obviously, it would be better for the destination host to correct their
> shortcomings but in the interim, I need to figure out a solution.

http://www.postfix.org/postconf.5.html#smtp_discard_ehlo_keyword_address_maps

You can tell the smtp client to discard ehlo for broken destinations.

Sandy

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