Mailing list software / would any one want it?

Hi,

does any one know of any good mailing list software specifically for mailing certain groups of people about certain products etc.

I have tried this with Outlook and it doesn't seem up to the job.

Maillist King looks good but doesn't appear to work either...

you could take a look here: http://www.hotscripts.com/PHP/Scripts_and_Programs/Mailing_List_Managers/index.html