There are many open source alternatives for eMarketing than paying out hundreds and thousands of dollars. Below is a list of applications which I believe can be potentially be used as email marketing alternatives.

OpenEMM
http://www.openemm.org/

YAP Email Manager
http://www.makisoftware.com/dnn/YAPEmailManager.aspx

Dada Mail - web-based e-mail list management system
http://sourceforge.net/projects/mojomail

phplist - a newsletter manager
http://sourceforge.net/projects/phplist

tellmatic - php and mysql based newsletter script to create, manage and send personalized newsletters or mass mails
http://sourceforge.net/projects/tellmatic

Mailman - a GNU mailing list manager that provides list management features, integrated with a web interface
http://sourceforge.net/projects/mailman
http://wiki.list.org/x/DgAJ

poMMo - mass mailing software
http://sourceforge.net/projects/pommo

If you do require any assistance in installations of the above applications. Feel free to contact me on: asfahaan@tasmanit.com