Comment 34 for bug 956618

This bug is still present as of 3.1.7 - ie. Use of a unique nicknames doe not result in the associated email address appearing as the first item in the list of suggested email addresses after the autocomplete function runs. I suggest tha in the tab:

  Tools -> Options -> Composition -> Addressing:

an option of the form:

  [ ] Search Nickname field first?

.. be added, and of course the code updated to work that way.