Default address book
Select the default address book where new contacts are saved to when adding them from the mail view.
List contacts as
Choose how names are displayed in the contact list.
Select the contact attribute used for sorting the contacts in the list.
Rows per page
The number of contacts displayed at a time (aka a “page”) in the contact list.
Skip alternative email addresses in autocompletion
With this option checked, every contact will only appear once in the autocompletion list that appears when you start typing in the recipient field. The first email address of the selected contact will then be inserted. If disabled, all email addresses of a matching contact are displayed for selection.