To Configure Back End Stores with LMTP and No MTA

The back end stores need no MTA if they are receiving messages over LMTP. This means that they have no job controller, and none of the address rewriting machinery associated with the MTA. They do however still require a dispatcher and a simple MTA configuration. In particular they need a dispatcher.cnf file and a mappings file which comprise the only significant part of the MTA configuration.

The dispatcher.cnf file must contain the following:

! rfc 2033 LMTP server - store 
!
[SERVICE=LMTPSS]
PORT=225
IMAGE=IMTA_BIN:tcp_lmtp_server
LOGFILE=IMTA_LOG:tcp_lmtpss_server.log
PARAMETER=CHANNEL=tcp_lmtpss
STACKSIZE=2048000
! Uncomment the following line and set INTERFACE_ADDRESS to an 
! appropriate host IP (dotted quad) if the dispatcher needs to 
! listen on a specific interface (e.g. in a HA environment).
! INTERFACE_ADDRESS=!
! rfc 2033 LMTP server - native
!
[SERVICE=LMTPSN]
PORT=226
IMAGE=IMTA_BIN:tcp_lmtpn_server
LOGFILE=IMTA_LOG:tcp_lmtpsn_server.log
PARAMETER=CHANNEL=tcp_lmtpsn
STACKSIZE=2048000
! Uncomment the following line and set INTERFACE_ADDRESS to an 
! appropriate host IP (dotted quad) if the dispatcher needs to 
!listen on a specific interface (e.g. in a HA environment).
!INTERFACE_ADDRESS=
         

Note that by default, the LMTP services in the dispatcher.cnf file are commented out. You must uncomment them to get LMTP to work.

The normal dispatcher options of MAX_CONNS, MAX_PROCS, MAX_LIFE_CONNS, and MAX_LIFE_TIME can also be set, but need to be set appropriately for your hardware.

The PORT_ACCESS mapping is important. The LMTP implementation for the back end servers is intended as a private protocol between Sun Java System Messaging Server relays and back end stores. You must use the PORT_ACCESS mapping to make sure that only such relays can connect to these services. Your mapping file should look like this:

PORT_ACCESS

  TCP|*|225|1.2.3.4|* $Y
  TCP|*|226|1.2.3.4|* $Y
  TCP|*|225|1.2.3.5|* $Y
  TCP|*|226|1.2.3.5|* $Y
  TCP|*|*|*|*   $N500$ Do$ not$ connect$ to$ this$ machine
         

You should replace the sample IP addresses specified in the PORT_ACCESS mapping table here with the IP addresses of your relays on the network that connect to the back end stores.

There has to be an imta.cnf file, but it is there merely to make the configuration complete. A minimal imta.cnf file consists of the following channel definitions:

! tcp_lmtpss (LMTP server - store)
tcp_lmtpss lmtp 
tcp_lmtpss-daemon

!
! tcp_lmtpsn (LMTP server - native)
tcp_lmtpsn lmtp 
tcp_lmtpsn-daemon

Note that by default, the LMTP channel definitions are commented out. You must uncomment them if you want LMTP to work.