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Re: ESMTP header (Hdr220)
On Mon, Sep 06, 1999 at 07:07:13PM +0000, Alexey Lobanov wrote:
> Just a note.
> To start ESMTP session, some clients (i.e., Postfix) want to see
> "ESMTP" word in 220 initial server reply.
> In case of two-string reply, like Zmailer-'51 default config, the
> results seems to be unpredictable. I.e., same Postfix says EHLO if
> ESMTP is present in _second_ line. So, the default "smtpserver.conf"
> with uncommented Hdr220 parameters forces plain SMTP session -
> without TLS, etc.
> The advice is to have "ESMTP" in ALL initial strings... or just to
> have a single 220 string :-)
Sigh... All that is against RFC 1869 part 4 ...
Word "EHLO" is present at following RFCs:
(well, some removed.)
rfc1425.txt rfc1651.txt rfc1869.txt EHLO/framework
rfc1426.txt rfc1652.txt BODY=8BITMIME
rfc1427.txt rfc1653.txt rfc1870.txt SIZE=nnn
rfc1854.txt rfc2197.txt PIPELINING
rfc1891.txt ESMTP DSN facility
rfc1894.txt ErrorMsg formats
rfc2554.txt SMTP AUTH
rfc2645.txt On-demand Mail Relay
Nowhere in these is a note telling that one should do
EHLO protocol only when word "ESMTP" is present in the
initial greeting message. Do note that even though
ZMailer smtp transport-agent has '-E' option to behave
in that manner, it is *not* a per default active mode.
From somewhere I seem to recall that one should *not*
do that "ESMTP" analysis.
Hmm.. Current Drums Draft doesn't say a thing about it either.
/Matti Aarnio <email@example.com>