Nicknames are used for extra email address that work for your mailbox. They are also sometimes referred to as "aliases". For example you can have a mailbox of email@example.com and have the nickname of firstname.lastname@example.org.
All messages sent to nicknames will go to the same mailbox.
Steps to add a nickname for a mailbox
Follow the steps below to add a nickname for a mailbox:
Click on your mailbox name from the list of email addresses.
Click the "Add a nickname" link.
Fill in the nickname (to add the nickname email@example.com use "james"). (see Figure 1)
Click "Save changes" to add the nickname.