[pmwiki-users] collecting e-mail addresses for a newsletter

[Jabba Laci]

Hi,

I have a PmWiki site for a project where users can download the
software. I'd like to add the feature "subscribe to newletter". The
idea is very simple: users can write their e-mail addresses in a text
field and the result is stored in a file.

Questions:

- Do you know a module that can do this?
- How to store the result securely? That is, the file containing the
addresses should be hidden from outside.
- Next step: what is the simplest way for sending newsletters?

        Thanks,

                 Laszlo