This patch updates the shell scripts with some of the common best
practices, which should make them more resilient to unusual failures and
unexpected environments (in particular, directories with spaces).
Most of these were identified by shellcheck.
mda-lmtp is a very basic MDA that uses LMTP to do the mail delivery.
It takes command line arguments similar to maildrop or procmail, reads an
email via standard input, and sends it over the given LMTP server.
Supports connecting to LMTP servers over UNIX sockets and TCP.
Since chasquid does not support direct LMTP local delivery, this can be
used as a workaround instead.
Example of use:
$ mda-lmtp --addr localhost:1234 -f juan@casa -d jose < email
