No changes otherwise.

by the coding standards, see CODING_STANDARDS.html). I also unified the
format and the location of the $Id$ tag. It starts with "//" and is placed
on the second line in all *.module files, now.

 that of user_validate_name and throw an error on null cases.  This module needed to be updated. As a result, it was thus forcing users
 to enter a mail alias.

These addresses are used by mailhandler.module to authenticate incoming emails.