Peter Wienemann via Postfix-users:
> Dear Wietse,
>
> thanks for your careful review.
>
> On 2024-01-05 16:11:56 +0100, Wietse Venema via Postfix-users wrote:
> > Peter Wienemann via Postfix-users:
> >> smtp(8):
> >> ------------------------------------------------------------------------
> >> The Postfix SMTP+LMTP client supports multiple destinations separated
> >> by comma or whitespace (Postfix 3.5 and later). Delivery is tried in the
> >> specified order. For each individual destination the delivery rules of
> >> RFC 5321, Section 5.1 are applied.
> >> ------------------------------------------------------------------------
> >
> > Unfortunately this says that RFC 5321 applies to LMTP deliveries,
>
> 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."
Indeed. The PROTOCOL FORMAT is similar to SMTP with small differences.
However the USAGE is completely different.
1 - RFC 2033 says that LMTP [...] MUST NOT be used on the TCP service
port 25.
2 - MX records specify where a domain receives email on the TCP
service port 25.
Therefore, MX records MUST NOT be used to locate an LMTP service.
I am not going into the rest of the responses. I will only state
that Postfix documentation is NOT A TUTORIAL for how email works.
Wietse
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