Android :: Resolve Mail Address To Contacts Name

Assuming I have a contact saved in my addressbook, called "TomTasche" with the mail-address "stackoverflow@gmail.com". How can I retrieve the contact's name, if I only know the mail-address?

I already asked a similar questions about retrieving contact's nickname here, but if I change that code to query the mail, like that:

CODE:...........

It forces close and logcat tells me that there's a syntax error near @gmail.

CODE:..................

Interesting is that it seems to query fine. Logcat prints out the contact's name:

CODE:.............

How am I able to retrieve the name?

Syntax Error is caused by missing quotes, but cursor returns null anyway.