What are some alternatives?
GroupSpaces - Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Roundcube - Web-based IMAP email client
Basecamp - A simple and elegant project management system.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10