Account name
Insert here the name of the account: this is normally the same than User name,
but it doesn't have to, and is the value you'll have to insert in your e-mail client
as a mail user to check.
For example, if you've user myself on an external mail server, you can
put myself_filtered, any other significant name, or just myself here and in the user
name of the email client (as long as you'll do that in both places), while in User name dialog
you must input myself.
Clicking Cancel here or in any of the following screens will bring
you to a dialog where you can insert all data at once, as opposed to insert them
one by one with a detailed explanation.