I am sure you have seen this in many sites: before letting you download the trial version of a software you have to register to get future email announcements.
Is there a PHP or Perl script/s that does this already? I imagine it could be connected to Mailman (but doesn't have to).
Another option is to use a CMS just for this, but is it worth having a CMS just for this?
Any ideas? I don't want to reinvent the wheel if I don't have to