I am receiving this error. From my understanding, this has to do with GOogle's 2-step verification process. Is there anything that can be done to fix this? It works for several days, but then the connection is refused.
ERROR: Password not accepted from server: 535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 http://support.google.com/mail/bin/answer.py?answer=14257