Unfortunately - Did not fix the problem
Thanks for sending the file, sorry for the confusion.
I replaced the mail_php.php in the webassist/email/ folder.
This made the page give a 500 error even if no security was applied.
[03-Jun-2011 09:36:44] PHP Fatal error: Cannot redeclare wa_securityassist_getemailarray() (previously declared in /home/xxxxxxxx/public_html/webassist/security_assist/mail_php.php:3) in /home/xxxxxxxx/public_html/webassist/email/mail_php.php on line 32
I have therefore put back the original mail_php.php file - so at least I can use the page with no security applied.
Any further help will be greatly appreciated