PolyTampa has an announce list that is used to distribute meeting details, and any other important announcements. This list is moderated, and the traffic is very low; so you don't have to worry about flooding your inbox. You can join the mailing lists by using the easy subscription form on the main page, or emailing email@example.com and responding to the confirmation email you will recieve.
PolyTampa also has a discussion list. You can join the discussion list by visiting the Yahoo! Group Discussion Email List or by emailing PolyTampafirstname.lastname@example.org.
OrlandoPoly, an Orlando based group for people interested in polyamory, also has a discussion mailing list. It's open to anyone. You can subscribe by sending an email to email@example.com or by visiting groups.yahoo.com/group/orlandopoly. You can also visit sites.google.com/site/orlandopoly for a list of all the other ways to get in touch with OrlandoPoly, including Facebook, Fetlife, LiveJournal, Twitter, Yahoo, email, etc.