Created attachment 8478216 [details] blank_list.ldif User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36 Steps to reproduce: 1. Import the attached LDIF address book into Thunderbird 2. You should have a new address book with a mailing list without a name ("") 3. Change the e-mail address in that address list to your own for testing, instead of email@example.com 4. Try composing a new e-mail and sending it to an address that does not exist in your address book Actual results: The e-mail is sent to the people in the "blank" address list instead. Expected results: The e-mail should have been sent to the written e-mail address.