git shortlog --author=Me

[Brendan Maginnis <brendan.maginnis@xxxxxxxxx>]

If I have a .mailmap file containing
  Me <brendan.maginnis@xxxxxxxxx> brendanator <brendan.maginnis@xxxxxxxxx>

And I run
  git log --author=Me
I see all my commits

However if I run
  git shortlog --author=Me
my commits are not shown