What is your anti-virus software?

Try to start Windows in safe mode with networking enabled.

Does the problem go away?

Is there a 64 bit edition?

There is. https://www.thunderbird.net/en-US/thunderbird/all/#E

Hi Christ1,

My antivirus software is Sophos (Great BTW) but I did not load their firewall, they recommend Windows for that.

From msconfig: I went to the Boot Tab and checked Safe Boot and there was not change.

Next, from the General Tab I checked Diagnostic StartUp (No network enabled option) and then Tb cannot connect to the server, no in mail either.

Settings changed back restored previous condition. This was my first use of Safe Mode in Win 10 so I'm not sure I tried the correct option but still can't connect to outgoing server.

Would the 64 bit version be any different? (thx I did find it)

Any other thoughts on what might be the problem or places to look would be much appreciated.

Thx again,

alr3

From msconfig: I went to the Boot Tab and checked Safe Boot and there was not change.

The article lists three possible options how to get into safe mode. Using msconfig is none of them. If the instructions for Windows safe mode linked above didn't help, I'd suggest you use Google to find better instructions. There are also good tutorials on Youtube.

Hi Christ1 and Others,

I found the find safe mode with networking, logged on and sent a test message. Same result:

Send Message Error: ...connection to Outgoing server (SMTP) mail.sonic.net timed out.

Does this rule out antivirus and firewall problems. What remains that could be the problem?

Again, this has worked flawlessly on Win 8.1 for ~ a decade. I'm not sure where to look, any suggestions or references would be much appreciated.

Thanks again,

alr

Does this rule out antivirus and firewall problems.

Most likely yes. Firewall shouldn't be an issue in the first place, as it usually doesn't block outgoing connections. At least the Windows built-in firewall does not. I don't know what Sophos does. What you need Sophos for exactly is still beyond me, but that's up to you.

What remains that could be the problem?

Server configuration? Check this support article for possible problems. https://support.mozilla.org/kb/cannot-send-messages

Also please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button , then select Help > Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

Hi again,

Sorry for the delay from distractions:

I have turned off anti-virus ruling out Sophos Ruled out a TLS problem because I have a machine that sends from some addresses

Attached is a copy of the Troubleshooting Info as requested. (as would fit) Thanks for any further thoughts on resolution.

Regards,

alr

Troubleshooting Information This page contains technical information that might be useful when you’re trying to solve a problem. If you are looking for answers to common questions about Thunderbird, check out our support website. Include account names (possibly identifying information) Application Basics Name Thunderbird Version 78.6.1 Build ID 20210107201950 Distribution ID Update Folder C:\ProgramData\Mozilla\updates\8216C80C92C4E828 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 OS Windows_NT 6.3 Application Binary C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe Profile Folder (Local drive) Build Configuration about:buildconfig Memory Use about:memory Performance about:performance Registered Service Workers about:serviceworkers Launcher Process Enabled Multiprocess Windows 0/0 Disabled Remote Processes 0 Enterprise Policies Inactive Google Location Service Key Missing Google Safebrowsing Key Missing Mozilla Location Service Key Missing Safe Mode false Profiles about:profiles Telemetry Data about:telemetry Mail and News Accounts ID Incoming server Outgoing servers Name Connection security Authentication method Name Connection security Authentication method Default? account1 (imap) imap.sonic.net:143 STARTTLS Normal password mail.sonic.net:587 STARTTLS Normal password true mail.sonic.net:587 STARTTLS Normal password false mail.sonic.net:587 STARTTLS Normal password false account2 (none) Local Folders None Normal password account3 (imap) imap.sonic.net:143 STARTTLS Normal password mail.sonic.net:587 STARTTLS Normal password true account4 (imap) imap.sonic.net:143 STARTTLS Normal password mail.sonic.net:587 STARTTLS Normal password true Crash Reports for the Last 3 Days Report ID Submitted

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Try SSL/TLS on port 465 for the outgoing. Their instructions suggest port 587 is used with no security, although here they seem to indicate port 587 with STARTTLS security is possible, if not recommended.

Thanks sfhowes for the suggestion I have set this up in many configurations and tried this one again with the same result.

Then I matched the settings up to my Win 8.1 machine exactly where I can still send emails and tried to send emails from the same email address with no change! I have ruled out the anti-virus and fire wall though they are the same on both machines. The only difference I am aware of is the OS. What's different about Win 10 in this regard?

The bottom line is that I can send emails as I have for years before getting a Win 10 machine where I have never been able to send even one email from any address. I bet this is something simple but I sure don't see it.

Any suggestions about where to look would be much appreciated.

Thanks to all,

alr