RE: General Command Line LMTP Client

On Mon, 10 May 2004, Covington, Chris wrote:

> >Take any existing ESMTP client:
> >.
> >.
> >.
> >The rest is the same.
>
> If it's that simple for the client, is it much more difficult to develop
> a Postfix LMTP server?
>

Wietse apparently has one that he has never released. The "smtp-sink"
program supports server-side LMTP (for testing the LMTP client).

The key question is why would LMTP server support be useful? LMTP is
specifically designed for final delivery into a mail-store without
a queueing step, which means that delivery to some recipients may fail.

When accepting mail into the Postfix queue, all recipients always succeed.
Delivery happens later. So an LMTP server in front of cleanup and the
Postfix queue would just waste bandwidth returning multiple 250 Ok
responses for each recipient.

The only plausible advantage of LMTP would be support for per-recipient
quotas, but even that does not work right when some of the recipients are
groups. LMTP (by design) delivers each address to a single logical
(perhaps shared, but still one) mailbox there is no 1-to-many expansion in
LMTP.

--
Viktor.

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