Dear Viktor, dear Wietse,
thanks again for your vigilant eyes.
On 2024-01-05 19:31:35 +0100, Viktor Dukhovni via Postfix-users wrote:
On Fri, Jan 05, 2024 at 06:46:01PM +0100, Peter Wienemann via Postfix-users
wrote:
RFC 2033 says: "The LMTP protocol is identical to the SMTP protocol [SMTP]
[HOST-REQ] with its service extensions [ESMTP], except as modified by this
document."
But, in fact LMTP MX records are only for SMTP relay, and to not apply
to either submission or LMTP.
I do not find any exceptions mentioned in RFC 2033 concerning the choice of
target hosts. Therefore - to my understanding - the same target selection
rules apply for SMTP and LMTP. If this is a misunderstanding on my part,
please correct me.
They do not. MX records specify the location of the inbound SMTP
servers for a domain, and there is no reason to expect to find the
associated LMTP servers at the same set of servers.
I completely overlooked that part.
Since the RFC failed to note this distinction, the problem is with the RFC.
It seems that I am in good company with my mistake. Obviously the same
happened to the author of the Postfix documentation, too. ;-)
Here is an excerpt from smtp(8)/lmtp(8):
-----------------------------------------------------------------------
The SMTP+LMTP client looks up a list of mail exchanger addresses for
the destination host, sorts the list by preference, and connects to
each listed address until it finds a server that responds.
-----------------------------------------------------------------------
Best regards,
Peter
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