On Tue, 28 Apr 2020 at 20:00, John R Levine <johnl@xxxxxxxxx> wrote:
On Tue, 28 Apr 2020, Michael Thomas wrote:
>> It also confirms that it's used for submission, not SMTP, so I remain
>> baffled about what if any point you are trying to make.
>>
> I made no mention of what port I was referring to. It's not exactly news that
> SMTP-AUTH is gernerally used on the submission port, so likewise I have no
> idea what if any point you are trying to make.
IF a client connects to a server on port 25, that's SMTP. EXCEPT that if
the client then authorizes, it turns into submission, even though it's not
on port 587.
RFC 4954 says that it defines a service extension for SMTP, not Submission. It does say the extension is appropriate for Submission, but makes no suggestion that this is any kind of defining factor. Equally, RFC 6409 does not mandate SMTP-AUTH, but does refer to it as exactly that name.
Dave.
