There are the following options:
You can change the name of your primary E-Mail account. This name is displayed in the E-Mail settings.
Change the preset sender name.
You can change the folders of your primary E-Mail account by assigning other folders to a standard folder.
How to edit the primary E-Mail account:
Click the icon on the right side of the menu bar. Click the menu item.
In the sidebar, click on .
Click on next to E-Mail in the display area. The Edit mail account window displays the current settings.
To change the account name, click into the input field next to .
Note: The entries for Incoming server and Outgoing server can not be changed.
To change the preset sender name, click into the input field next to .
You can overwrite this preset name when composing an E-Mail.
To select other folders, browse down to Standard folders.
Click on next to a folder. Select another folder.
Click on at the bottom of the window.