newmail is a command line utility to check for new/unread mail in a recursive Maildir++ folder structure. It is written in pure ANSI C, should work on any POSIX compatible system, and can be used for other stuff—like, for example, in combination with Mutt—too.
These details are provided for information only. No information here is legal advice and should not be used as such.
At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.