Triggermail is a project mainly written in Perl, it's free.
Sailthru Client for Perl
INSTALLATION
To install this module type the following:
perl Makefile.PL make make test make install
DEPENDENCIES
This module requires these other modules and libraries:
Digest::MD5; JSON::XS; LWP; HTTP::Request; URI::Escape; Params::Validate;
COPYRIGHT AND LICENCE
Copyright (C) 2011 by Sam Gerstenzang
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.0 or, at your option, any later version of Perl 5 you may have available.