jenže s tím to jaksi nesouvisí. Vysvětlení je jasně a jednoznačně popsáno v mailu, nechápu, co řešíš.

Technical details of permanent failure:
The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. Please resend your message at a later time. If the user is able to receive mail at that time, your message will be delivered. For more information, please visit http://support.google.com/mail/bin/answer.py?answe r=6592