Dear Thunderbird Team! After the latest update on version 91 (updated on the 27th of October) i am not able to send more than one messages. So i can send the first email without any problem. But when i want to send another email, the sending never finishes and the email is not transmitted to the receiver. Attached you can see my notification. I can only fix this problem, with restart my PC. But it´s quite annoying to restart each time, when i want to send another email. There was no such problem with every previous version of Thunderbird. Thank you in advance for every response! Matthias