While 37signals recently added the oft requested ability to allow Basecamp users to reply to messages and comment notifications by email, a new add-on service called Mailmanagr takes that one step further by allowing you to create new project items as well.
Create and assign custom email addresses to any area of your project and then forward messages, to-do items and milestones directly into your project without logging in. It’s very useful for forwarding emails you receive outside of Basecamp into the system or for making quick entries from your mobile.
If you have implemented Basecamp in your organization and are still seeing significant external email discussions, Mailmanagr can help get these items into the system for tracking. If your folks are really that resistant to logging in though, you may want to consider if you have made the right choice to accommodate the work style of our clients and co-workers.