What is the return address nickname?

Return addresses, courtesy and business reply addresses, EDDM addresses and billing addresses are given nicknames. 

When adding new addresses or these types, choose meaningful nicknames that will help you identify them quickly when you look at a list of these addresses stored in your account. Nicknames can only include letters or numbers - spaces and other characters are not accepted.

When you edit these addresses, you can also edit the nickname. The edit nickname link will be located above the address information.