The “Fachschaft” has a number of mailing lists to inform it’s subscribers about miscellaneous things. E.g. whoever writes to fachschaft@mathphys gets a mailing list of active council members, that can help you with most concerns.
For students that are interested in informations about events and important issues from both of or faculties there is the fs-info mailing list. You can subscribe via a webinterface and will seldom get more than five mails per semester. Unfortunately the fs-info mails are at the moment available in German only.
For job offers and Polls that we are asked to forward to our fellow students, there is a special Spam Mailinglist.
Apart from that, there is a events mailing list, that informs about social events like board game parties.