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TB cannot connect to SMTP server after updates

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  • Последний ответ от Matt

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Hi - Hopefully someone may point me in the right direction...

Using TB 68.10.0 (32-bit) on Windows 10 Pro - I can receive messages (IMAP) no problem, and could send messages (Last successful send was a couple of days ago). Now when I try to send, I get the error: "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) mail.nurdin.co.uk timed out. Try again."

The Mailserver uses TLS/SSL and connects to SMTP on Port 465.

I have tried switching off both Windows Firewall and my antivirus (Avast Free). I can connect and send messages on an Android Tablet (Using the default Samsung Mail App). I tried entering my connection details into the Windows Mail App, and this works perfectly!!! After my last successful sending from TB there was a Windows update, which installed the latest version of the Edge Browser (Which I don't use) - I assume that this has somehow made some change which is preventing TB from using the SMTP port?

I did try using the Swithmail client (A "bare bones" command line client), and this could not send either. Has anybody else encountered this problem?

Cheers - Henry

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My personal guess is Avast will be doing hat it is best at. Interfering.

A check of the server https://www.immuniweb.com/ssl/?id=8NQxQWKK indicates that OCSP stapling is not supported, so you might also need to turn of the "Query OSCP responder servers" under options > Advanced > certificates but this has been in Thunderbird for some time now, so I would not expect it to suddenly become a problem.

The standard advice for that is try the operating system in safe mode, but because these programs tend to "insert" bits of themselves into running applications, Thunderbird safe mode is also a needed test;

  • Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
  • Restart the operating system in safe mode with Networking. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, OSX
If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.

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