I cannot receive any messages in Thunderbird from my optonline.net email since Thunderbird update on 03/20/2019. Web email access works. Thunderbird does not ask for password. I eventually get a message that Connection to server at mail.optonline.net has timed out. I did not change anything else on my system.Windows 7 Pro with Norton Antivirus. POP mail server name is mail.optonline.net Set for port 110 Problems began after update to 60.6.0 Not fixed by update to 60.6.1 I can still send messages through this accopunt on Thunderbird. Problem is only downloading new messages. Thank you for any suggestions.