Write mailing lists in a textfile

Hi everyone,

What I am going to post here is a little bit similar to what I've posted already here: http://drupal.org/node/216995 I apologize for the cross posting, but I'm not really sure which module might do what I want.

On our university website, we would like to send notifications of posts to users, but the e-mail policy of the mail server prevents our server from sending too many e-mails. As a workaround, the university suggested we could use their list server, sympa, and send the subscription mails to one single address at the list server.

Now, here is what I thought of: I could create something like 10 lists, and rotate through them. Every time a notification has to be sent out, the module would create a list with all the recipients and store it in a text file. Then, it would send an e-mail to list1@myuniversity.com. Sympa will then retrieve automatically the text file and do everything that is appropriate. The next subscription would be sent to list2, and so on. The rotating of the lists would be to avoid time conflicts (when two or more subscriptions are posted at the same time), and 10 is enough because not so many users are allowed to send e-mails to mailing lists.

An alternative could be, of course, to use "static" lists, because notifications will only be sent to users subscribed to different taxonomies. Maybe that's easier to implement, but maybe also more restrictive (if I want to restrict the access for some users, static lists might not be a good option, especially when two users post a topic in the same taxonomy at the same time).

If anyone has an idea which module would be the easiest to modify for that purpose, I would be very grateful.

Have a nice day and thanks a lot,

Felix.