There are two types of listservs at SPH, one for discussion groups and another for broadcast e-mail.
Discussion groups are for users to exchange information via e-mail.
Lists set up to facilitate broadcast e-mail are used by SPH administration to communicate general announcements to users. These are meant to by one-way communications, not discussions. The messages are screened and approved by designated personnel for content and appropriateness. You need an e-mail account in order to join a list. The account can be on any system that can send and receive mail from the Internet.