That often happens when only half of you email account under Windows Mail
is set up correctly. Ask your email provider (who is probably also your
internet provider) for their instructions for setting up to use their email
servers.
If they haven't written instructions for Windows Mail yet, their
instructions for
Outlook Express should also work under Windows Mail as long as they don't
call for using the HTTP protocol. The instructions are probably somewhere
on their web site. Or, you could tell us who your email provider is and see
if
anyone here already knows where to find the instructions.