ietf-smtp
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Re: rfc2821bis-04, Issue 38: MX queuing behavior with options

2007-06-01 04:01:36

On Thu, 31 May 2007, John C Klensin wrote:

I believe that, with the way the text in 2821 is written, a
client that is successful in opening an SMTP session (getting
the 220 greeting, sending an EHLO command, and getting a
response) to at least one of smtp1 or smtp2 is not permitted to
fall back to backup.foo.example under any circumstances.

No: it says "the SMTP client MUST be able to try each of the relevant
addresses in this list in order, until a delivery attempt succeeds", so
after a successfully established connection but a failed (4yz) delivery
the client will try another server.

Tony.
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