We have a newsletter that is available to our clients by email or postal mail. Right now, we are collecting email subscriptions through our website but I would like to move that to an Emma form so that emails are automatically added to our mailing list. However, I would like to give subscribers an option to receive by email and/or by postal mail. On the sign up form, I can't make email address an optional field the way I can with name, address, etc. Thoughts on how I can accomplish this with just one form? Also, will I be able to export the subscribers' postal addresses for my print list?