On 30 Oct 2016, at 16:57, Jeremy Harris wrote:
On 30/10/16 20:31, Bill Cole wrote:
On 30 Oct 2016, at 11:45, Jost Krieger wrote:
without the magical word ESMTP, no one is allowed to use EHLO.
You've invented a non-existent rule. I hope no one has made the
blunder
of enshrining that non-rule in code or teaching it as fact.
According to Exim source comments, having ESMTP in the banner was a
convention as of 1998 (to advertise the capability) but by 2000
it was deemed reasonable to always attempt EHLO first.
Comments in a MTA's source can say anything. There is not now and never
has been a generally accepted SMTP specification that recommends
anything specific other than the server FQDN or an IP literal in the
greeting banner. There have been clear vehement admonitions against
relying on any particular (or even ANY) text part in any SMTP reply,
including the initial greeting, in multiple standards-track RFCs.
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