Lightweight LMTP daemon to avoid overkill MTA

[Marc Roos]

Yes dovecot, /etc/dovecot/conf.d/20-lmtp.conf ;)

service lmtp {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = lmtp
  extra_groups = $default_internal_group
  group =
  idle_kill = 0
  inet_listener lmtp {
    address =
    haproxy = no
    port = 24
    reuse_port = no
    ssl = no
  }
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol = lmtp
  service_count = 0
  type =
  unix_listener lmtp {
    group =
    mode = 0666
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}


-----Original Message-----
To: dovecot at dovecot.org
Subject: Lightweight LMTP daemon to avoid overkill MTA

Hi,

My situation is as follows.

-An internet-facing spam filter relays email to destination mail server 
(Dovecot) with SMTP.
- Dovecot should take email and deliver it to user's mailboxes. I guess 
I'd need LMTP for this.
- An external SMTP relay is already in place. I am thinking of using 
Dovecot submission to relay to the external relaying cluster.

So, both relaying and routing are done externally - the Dovecot machine 
should only store mail. Of course, there should also be a mechanism that 
takes care of local delivery to Dovecot, like LMTP. Usually, I would use 
an MTA like Exim to take care of local delivery. I feel like a 
fully-featured MTA is overkill, though, as all other roles such an MTA 
would fulfill - relaying and spam filtering - are fulfilled on external 
servers.

Q: Does anyone know of a lightweight LMTP daemon that can take care of 
local delivery to Dovecot without the need for a full MTA?

With kind regards,

William Edwards
T. 040 - 711 44 96
E. wedwards at cyberfusion.nl



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