It was already setup so I can't shed any light on that process. Because we store the names in a database I was able to check if the email was there, and if not allow them to send the subscribe/unsubscribe email. Here is the addition to profile.php
PHP Code:
// ## SK: Start Extra Profile Page - by Sarah King ##
if ($_REQUEST['do'] == 'editmaillist')
{
// makes the user cp nav look correct
construct_usercp_nav('editmaillist');
// sets the area discription, feel free to change
$navbits[''] = "Manage Automatic Emails";
// sets template name to be called when the action is preformed
$templatename = 'MAILLIST';
// sets shell template
$shelltemplatename = 'USERCP_SHELL';
// makes the user cp nav look correct
construct_usercp_nav('addmaillist');
// sets the area discription, feel free to change
$navbits[''] = "Manage Automatic Emails";
// sets template name to be called when the action is preformed
$templatename = 'MAILLISTCHANGE';
// sets shell template
$shelltemplatename = 'USERCP_SHELL';
$emailnewstatus = 'subscribe to';
$emailextra = "<b>A confirmation message has now been sent to {$bbuserinfo['email']}.</b><br><br>
To confirm your subscription, simply reply to that email.<p>"
}//if ($_REQUEST['do'] == 'addmaillist')
// makes the user cp nav look correct
construct_usercp_nav('removemaillist');
// sets the area discription, feel free to change
$navbits[''] = "Manage Automatic Emails";
// sets template name to be called when the action is preformed
$templatename = 'MAILLISTCHANGE';
// sets shell template
$shelltemplatename = 'USERCP_SHELL';
$emailnewstatus = 'unsubscribe from';
}//if ($_REQUEST['do'] == 'removemaillist')
// ## SK: End Extra Profile Page - by Sarah King ##
// ## ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ##