Re: [Exim] [cyrus] Exim callots and Cyrus (FYI)

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Autor: Tor Slettnes
Data:  
Para: Andrzej Filip
CC: exim-users
Assunto: Re: [Exim] [cyrus] Exim callots and Cyrus (FYI)
On May 31, 2004, at 09:17, Andrzej Filip wrote:

> http://anfi.homeunix.net/exim/rtvcyrus.html


Good work! This is a NSIAQ (not so infrequently asked question).

> Could you authoritatively confirm that Exim can't do callouts over unix
> sockets ? ("lmtp" transport with "socket" option")


This is correct. Exim callouts happen only over "remote" transports,
including "smtp" with the protocol set to "lmtp", but not over local
transports, including "lmtp" with "socket".


> Feel free to send comments and references to "previous art".


Well, an alternate way to verify recipients against Cyrus, which uses
the standard mechanism of delivering over UNIX domain sockets (and so
does _not_ require a TCP socket) is to invoke the supplied "mbpath"
utility in an Exim router:

   cyrus_lmtp_router:
     debug_print   = "R: cyrus_lmtp for $local_part@$domain"
     driver        = accept
     domains       = +local_domains
     local_parts   = ! root
     require_files = /usr/sbin/mbpath
     condition     = ${run {/usr/sbin/mbpath -q -s
user.${lc:$local_part}}{1}{0}}
     transport     = cyrus_lmtp_transport


....

   cyrus_lmtp_transport:
     driver           = lmtp
     socket           = /var/run/cyrus/socket/lmtp
     transport_filter = /usr/bin/tr -d \\000
     batch_max        = 20
     user             = cyrus



Note #1: Make sure that the Exim user can successfully run the "mbpath"
utility. On my system, I do that by adding it to the "mail" group
("adduser Debian-exim mail").

Note #2: The "${lc:$local_part}" syntax above translates $local_part to
lowercase before checking for its mailbox path. If you have Cyrus
users that are not all lowercase, you need to change this.

Note #3: The "transport_filter" strips off NULL characters in the
message, before delivering it to Cyrus. Cyrus rejects such messages,
and you would otherwise end up freezing them in your mail queue.