Now that SquirrelMail is installed we can configure it.
When defining a web site in the WebTool you are required to enter a user as the "webmaster" and assign a "group" to the web site. Those identities are needed for the following. When running the following commands replace WEBMASTER with the user that has been defined as the "webmaster" and replace GROUP with the group that was use.
# chown -R WEBMASTER.GROUP webmail
# cd webmail
# chgrp -R webd config data