Reputation and feedback are important.
I do not recommend tossing some random mass mailer software found on a web page somewhere onto a server and using it for bulk mailing. That most likely will lead to many problems and headaches, blacklistings, and eventually a ruined reputation and list of subscribers.
For those that are comfortable with their own servers I recommend Amazon SES as a platform where you can build a Linux instance and send out using the SES service which many email providers are aware of and providing feedback against.