I am unable to recieve mail on thunderbird for the last several days. I am receiving the message "Alert from account xxxx@comcast.net: Temporarily blacklisted IP Address - try again later (comcast is my mail provider) where is this message coming from and how do I clear it. I use a VPN and have shut that off but has not fixed the issue. I have the same VPN running on my Iphone and am able to still recieve messages via the Iphone mail client... Any thoughts?