I have used mozilla for many years. I know out to reset outgoing server timed out problems. It often happened when I changed my gmail or google passwords. I have the security on my gmail reduced to allow thunderbird. I have pop.gmail.com. I have tried various ports and connection security settings and authentification methods. I currently have server name smtp.gmail.com Port is 465. Connection is SSL/TLS Authentification is oAuth2. No matter how I reset it, it gives me timed out messages and won't send. And so I send it in gmail. Then later, it works to send some emails in thunderbird and 5 minutes later, I get "The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com timed out. Try again" Why would it work on one email and not the next? I have never had this many problems. What are the settings that work with pop.mail? I am ready to give up and just live with gmail!