mailing list subscriber:
> Ok, this? has been raised over a few times in the past, but I'm not
> satisfied with the answer (referral to man page of lmtp/smtp instead
> of idiot-proof narrative version like other *_README howtos).
As documented the LMTP and SMTP client are part of the same program.
The clients have identical behavior unless documented otherwise or
required by Internet RFCs.
This change was made 20051208, more than seven years ago.
Wietse
SMTP(8) SMTP(8)
NAME
smtp - Postfix SMTP+LMTP client
...
DESCRIPTION
The Postfix SMTP+LMTP client implements the SMTP and LMTP mail delivery
protocols. It processes message delivery requests from the queue man-
ager.
...
CONFIGURATION PARAMETERS
Before Postfix version 2.3, the LMTP client is a separate program that
implements only a subset of the functionality available with SMTP:
there is no support for TLS, and connections are cached in-process,
making it ineffective when the client is used for multiple domains.
Most smtp_xxx configuration parameters have an lmtp_xxx "mirror" param-
eter for the equivalent LMTP feature. This document describes only
those LMTP-related parameters that aren't simply "mirror" parameters.
