Re: [Exim] Testers needed: LMTP support

Phillip

I've finally had time to look at the LMTP support in exim 3.161, using the
deliver program from Cyrus 1.6.24 in batch mode. It seems to work OK -
though I've not tried it in production (our imap service is still under
development).

The current LMTP implementation in exim, unlike sendmail, only supports
program invocation. Cyrus 2 (currently in alpha) on the other hand provides
an LMTP daemon that listens on either a Unix domain socket or TCP/IP socket.
The MTA is expected to connect to this socket to make local deliveries. (I
believe the M-Store server from Messaging Direct uses a Unix domain socket
in a similar way).

Support in the MTA for LMTP delivery via TCP/IP or Unix domain sockets is
not essential to use Cyrus 2 (the deliver program is now a wrapper that can
be invoked by the MTA to act as a proxy LMTP client) but it would be nice.
It is presumably more efficient, and allows the MTA and IMAP servers to live
on different systems.

Another wrinkle is that when listening on a TCP/IP socket the Cyrus LMTP
daemon by default requires the MTA client to authenticate using the SMTP
AUTH extension. This is probably not essential (although an open LMTP
service accessible over the net is not a good idea!) but it might be useful.

Regards, John

John Holman
Head of Central Servers Team
Queen Mary and Westfield College
London, UK


> ----- Original Message -----
> From: "Philip Hazel" <ph10@???>
> To: <exim-users@???>
> Sent: Friday, August 25, 2000 3:39 PM
> Subject: [Exim] Testers needed: LMTP support
>
>
> > There have been several (well, two or three) requests for LMTP (RFC
2033)
> > support in Exim. This week, I finally got round to implementing it. As
> > it turned out, rather more internal re-arrangement was required than I
> > was expecting.[*] As I do not have any LMTP delivery programs myself, I
> > have only been able to test it in my testing harness, and not for real.
> > Therefore, those of you who want LMTP, please read on, and do some
> > testing.