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The lmtp
transport runs the LMTP protocol (RFC 2033) over a pipe to a
specified command
or by interacting with a Unix domain socket.
This transport is something of a cross between the pipe
and smtp
transports. Exim also has support for using LMTP over TCP/IP; this is
implemented as an option for the smtp
transport. Because LMTP is expected
to be of minority interest, the default build-time configure in `src/EDITME'
has it commented out. You need to ensure that
TRANSPORT_LMTP=yes |
is present in your `Local/Makefile' in order to have the lmtp
transport
included in the Exim binary. The private options of the lmtp
transport are
as follows:
| Use: lmtp | Type: string* | Default: unset |
See the description of local delivery batching in chapter Address batching in local transports.
| Use: lmtp | Type: integer | Default: 1 |
This limits the number of addresses that can be handled in a single delivery. Most LMTP servers can handle several addresses at once, so it is normally a good idea to increase this value. See the description of local delivery batching in chapter Address batching in local transports.
| Use: lmtp | Type: string* | Default: unset |
This option must be set if socket
is not set. The string is a command which
is run in a separate process. It is split up into a command name and list of
arguments, each of which is separately expanded (so expansion cannot change the
number of arguments). The command is run directly, not via a shell. The message
is passed to the new process using the standard input and output to operate the
LMTP protocol.
| Use: lmtp | Type: boolean | Default: false |
If this option is set true, the string `IGNOREQUOTA' is added to RCPT commands, provided that the LMTP server has advertised support for IGNOREQUOTA in its response to the LHLO command.
| Use: lmtp | Type: string* | Default: unset |
This option must be set if command
is not set. The result of expansion must
be the name of a Unix domain socket. The transport connects to the socket and
delivers the message to it using the LMTP protocol.
| Use: lmtp | Type: time | Default: 5m |
The transport is aborted if the created process or Unix domain socket does not respond to LMTP commands or message input within this timeout.
Here is an example of a typical LMTP transport:
lmtp: driver = lmtp command = /some/local/lmtp/delivery/program batch_max = 20 user = exim |
This delivers up to 20 addresses at a time, in a mixture of domains if necessary, running as the user exim.
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