In the past we offered mailman on our servers to allow our clients the ability to make and generate free mailing lists. However due to abuse, and the fact that many clients share not only a server, but also a common IP address, this has the potential to reflect badly on all who share the server.
As a result we disabled that service, and are proud to recommend a great alternative.
Please browse over to Mailchimp and check out their offerings. We are not paid a commission for this referral - we just think they offer a great service, and its free for mailing lists up to 2000 people.
Any list you create there can be easily integrated into your website. If you don't know how, ask us for a quote and we will happily do it for you. Plus you will be sending using their IP addresses and benefit from higher delivery rates.