On Mon, Apr 19, 2004 at 11:20:01AM +0100, Tony Finch wrote:
Although you MUST NOT reject EHLO/HELO, that doesn't mean you can't reject
This is not true.
RFC 2821 Simple Mail Transfer Protocol April 2001
4.3.2 Command-Reply Sequences
[ ... ]
In addition to the codes listed below, any SMTP command can return
any of the following codes if the corresponding unusual circumstances
are encountered:
[ ... ]
421 Service shutting down and closing transmission channel
[ ... ]
Specific sequences are:
CONNECTION ESTABLISHMENT
[ ... ]
EHLO or HELO
S: 250
E: 504, 550
and later:
7.7 Scope of Operation of SMTP Servers
[ ... ] When mail
is rejected for these or other policy reasons, a 550 code SHOULD be
used in response to EHLO, MAIL, or RCPT as appropriate.
\Maex
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