One catchy web address, Popsy.is4u.com, always directs participants to the current campaign's landing page on the corporate web site.
Using his is4u.com / r4u.com promo Address, John can point JohnSmith@is4u.com to his Gmail account, and point JohnSmith.is4u.com to his Wordpress site. Now everybody can remember how to find John Smith.
In the future, John can always make his is4u.com / r4u.com promo Address point to whichever email and website he chooses. His contacts continue to use JohnSmith@is4u.com and JohnSmith.is4u.com like always. Marketing and advertising don't need to be changed. Customers and contacts don't all need to be notified. Everybody still knows how to find John Smith.