IMAP connection
Hello, I have a problem with Thunderbird that I don't understand and can't solve. Thunderbird can't connect to my IMAP account on the remote server perfectly even after a clean install. Incoming emails are downloaded, but only 82 out of 5600 outgoing emails. All login details are correct, I tried STARTTLS settings on the correct ports, but there is no change. I see in the Activity Manager that the connection between the server and the client is lost several times a minute. There is no network error, both I and the internet service provider have checked the connection. The client is running the Win11 operating system.
Robert
Modified by Balázs Meskó
All Replies (3)
Do you have an antivirus scanning encrypted connections or email specifically. Both actions can cause issues as you describe if it goes wrong and it appear to go wrong a lot if the reporting in these forums are anything to go by.
I have a virus scanner and a VPN connection, but I deleted both from the machines. I also restarted the router with factory settings. This was my first thought too, but unfortunately it did not solve the problem. The strange thing is that this error appears on three different machines, even with a fixed IP address. However, Roundcoube webmail and Outlook iOs work flawlessly, but Thunderbird does not.
I just realized that all of those events happened at exactly the same time. 20 hundred hours.
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