From: Bill Cole (postfixlists-070913billmail.scconsult.com)
Date: Wed Oct 10 2007 - 09:14:19 CDT

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At 3:41 PM +0200 10/10/07, Rocco Scappatura wrote:
>Hello
>
>For some recipients (belonging to a domain not managed by me) I get my
>mail bounced. From the DSN I get this error status:
>
> Diagnostic-Code: smtp;554 5.6.1 Body type not supported by
>Remote Host
>
>Basically, it always happens with windows servers (I suppose). For
>example, recently I get the error for a recipient. Telnetting the mail
>server (on port 25) which refuse my email error just today, I get:
>
> 220 mail.XXX.it Microsoft ESMTP MAIL Service, Version:
>6.0.3790.3959 ready at Wed, 10 Oct 2007 15:11:19 +0200
>
>I have looked for an explanation.
>
>I have found that is a bug (that is not in compliance with RFC 1854) for
>some Windows servers (which of them exactly?)

RFC1854 is an optional SMTP extension, and as such, failing to
support it is not reasonably described as a 'bug.'

However, I think you probably are misunderstanding this error. It is
more likely to be the result of a broken firewall that is trying to
'clean up' SMTP but doesn't really know how. The canonical example of
such firewalls is the Cisco PIX, but I think this particular problem
is more likely to be some less flagrantly broken device.

> and that it can be
>employed the following setting for postfix, as workaround for this
>problem:
>
>smtp_never_send_ehlo = yes
>
>But I dont have well understood where I can put this postfix
>configuration parameter to get no side effects..
>
>Could somebody give me an hint?

Look at the smtp_discard_ehlo_keyword_address_maps configuration
option. It is documented in the postconf(5) man page. You probably
want to discard the 8BITMIME extension for the afflicted servers.
--
Bill Cole
billscconsult.com

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