Click the Manage E-mail Addresses link from the Mail panel.
Manage E-mail Addresses
As seen in the image below, 1 out of 2 available Users has been set up. In this example, this is the result of just having canceled a 1&1 Mail Business account. Canceling a 1&1 Mail Business account will not automatically delete any 1&1 Mail Business Users. Select which 1&1 Mail Business account should be removed.
Overview of 1&1 MailXchange users
Click the arrow icon next to the 1&1 Mail Business User that is no longer needed.
A list of options will display. Click the Delete link to proceed with the cancellation process.
An overview page shows the 1&1 Mail Business account(s) to be deleted. If all is correct, click Delete.
For additional information, you may want to reference: