Email Server - send/receive email with bulk email marketing

Project Description:
I need an email server to be able to receive and send email from various domains. IMAPS, POP3S, SMTP with authentication should be used with similar setup described in:

A) http://www.unix-tutorials.com/go.php?id=4105
B) http://flurdy.com/docs/postfix/#install_distro

Postfix,MySQL, Courier, Amavis, ClamAV, Spamassassin, SquirrelMail, etc.

I have mail list that I would like to use to send email in BULK.

1) Multi-thread email server, capable of sending thousands per hour.
2) SMTP built in - not relying on relay server
3) Capable of sending from home or off-site server
4) Easy to use, and low cost -Preferred OS: Jaunty Ubuntu

I would provide you with login credentials to the server and you would be configuring solution. Any suggestions are welcomed.

Expected delivery:

1) server that works for multiple domains with bulk email capabilities
2) testing of bulk emailing