Javamath-discuss
A general mailing list for discussion about mathematical software development in Java.
Math Forum: Public Discussions
Group topics include general math, education, geometry, software, calculus reform, research and recreations.
Maths-Education
Email forum for those working in mathematics education to share ideas and experiences, and request information.
The Math Forum
Help and discussions about mathematics and philosophy, with problems of the week.
Yahoo Groups : Erdos
A group for proposing problems, sharing ideas, discussing areas of research and reviewing papers and books of interest. [Requires Yahoo! membership]
Yahoo Groups : maththeorists
Discussions relating to number and mathematics philosophy.
Yahoo Groups: Theory-edge
Informal discussion of research in algorithmics, mathematics, and their applications.