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Thunderbird/Gmail won't SEND messages with any attachments

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Gmail Minetfiber.com Windows Defender (OFF) Anti-virus (OFF) Windows 10 Thunderbird 60.7.2 32bit

I get "unknown reason" or, sometimes, "timed-out" error messages.

Gmail Minetfiber.com Windows Defender (OFF) Anti-virus (OFF) Windows 10 Thunderbird 60.7.2 32bit I get "unknown reason" or, sometimes, "timed-out" error messages.
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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

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Question owner

I should have added that I was unable to include a screen shot of my Account Settings, the "Add Images" button below just wouldn't work.

And I've spent about 6 hours trying every variation of fix that I could find on the web, except changing the Password. I deleted and setup new Thunderbird accounts with the automatic settings twice; changed the Ports/Authentication/etc. to every possible combination and a bunch of things I've forgotten besides those listed in the original message.

Thanks for any help you can provide,

Frank

I should have added that I was unable to include a screen shot of my Account Settings, the "Add Images" button below just wouldn't work. And I've spent about 6 hours trying every variation of fix that I could find on the web, except changing the Password. I deleted and setup new Thunderbird accounts with the automatic settings twice; changed the Ports/Authentication/etc. to every possible combination and a bunch of things I've forgotten besides those listed in the original message. Thanks for any help you can provide, Frank
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Question owner

SOLVED!

Killer Control Center has to be updated to match Windows 10 update to fix this. Why it interferes, I have no idea.

SOLVED! Killer Control Center has to be updated to match Windows 10 update to fix this. Why it interferes, I have no idea.
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