$EditPage: the EditPage object
'AlternateUserMailer': Called before mail is sent so that mail could
-be logged (or something else) instead of using PEAR or SMTP
+be logged (or something else) instead of using PEAR or PHP's mail().
+Return false to skip the regular method of sending mail. Return a
+string to return a php-mail-error message containing the error.
+Returning true will continue with sending email in the regular way.
$headers: Associative array of headers for the email
$to: MailAddress object or array
$from: From address