Sure, that would be worth a try to see if it works.
To change the port used for the registrration email, open the WA_Universal_Email/WAUE_users_Registration_1.php file and change line 16:
$WA_MailObject = WAUE_Definition("".($WAGLOBAL_Email_Server) ."","25","","","","");
to:
$WA_MailObject = WAUE_Definition("".($WAGLOBAL_Email_Server) ."","225","","","","");