We agree keeping your contact list up-to-date with the relevant contact information is important. With the Update Profile form, you can give your contacts a chance to update their information themselves. You will need to direct your contacts to click on the "Update Profile" link is included in your email footer. When your contacts click the link, they're sent the Update Profile email that you created. The email contains a link to your Update Profile form, where they can pick and choose the different contact details they want to share with you and select the different lists they want to be a part of.