- Send them through a 3rd party (completed with Mandrill)
- Make them look WAY better (with templates, MailChimp, etc)
- Make them more dynamic (with variables based on user's XF preferences)
- Different newsletters they can subscribe/manage from one admin (Daily, Weekly, Monthly, etc)
- Lots of options to customize what gets sent (X threads created within last Y days, sorted by most Z, different sections querying different forums, etc...)
Does something already exist? If so, link? If not, want to develop it for us?