So this might be a little archaic, but what I'm looking for is a free email list service. I want one that doesn't require members to create an account (like collaboration services require), and in which sign up is easy (either entering their email address on a site or emailing the list with a certain word in the subject). Then I want any of the members to be able to email the "master" email address, and have that forwarded to all the email addresses on the list. There will only be a couple dozen members, and it's just to inform everyone across multiple devices on a meeting time. The reason I don't want to use basic forwarding in gmail or whatever is because I'd have to manually enter every email address, and I'd rather have a more automated system.