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The ability to receive and send messages in all accounts abruptly disappeared

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Hi, February 18 suddenly lost the ability to receive and send messages in all accounts. I have 6 accounts from 3 different mail providers. The problem applies to all accounts. When you try to receive mail, no error appears. When sending mail, a message appears "the message cannot be sent because the connection time to the smtp server has expired". No changes were made to the settings. I have been using the program for many years, this is the first problem. Reinstalled the application, the problem remained. What to do?

Hi, February 18 suddenly lost the ability to receive and send messages in all accounts. I have 6 accounts from 3 different mail providers. The problem applies to all accounts. When you try to receive mail, no error appears. When sending mail, a message appears "the message cannot be sent because the connection time to the smtp server has expired". No changes were made to the settings. I have been using the program for many years, this is the first problem. Reinstalled the application, the problem remained. What to do?
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The problem appeared on February 18 in the morning. In the evening, after unsuccessful attempts to solve the problem, I just closed the application. On the morning of February 19th, I opened the application again, and lo and behold, everything works, letters immediately loaded, sending also works. I don’t understand what was the cause of the problem, if it itself was solved, without my help. Many thanks to everyone who helped with the advice.

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To diagnose problems with Thunderbird, try one of the following:

  • 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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Unfortunately, this did not help. I also completely disabled the antivirus, rebooted the system in safe mode and launched the program in safe mode with the settings disabled.

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Yandex offers this advice when sending and receiving fail:

"Enter your valid personal details in Yandex.Passport and link your phone number to your account. It may be that our security system considers your account suspicious and blocked the mailbox. This usually happens if you don't link a phone number to your mailbox or enter a fake name in Yandex.Passport. It usually takes a couple of hours to have your account unblocked."

I believe OAuth authentication is supported for all your accounts, so you could try that if it's not already applied. Delete the password or token in Tools/Options/Security/Passwords/Saved Passwords, restart TB, and enter the account password in the OAuth browser window when prompted.

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Suluhisho teule

The problem appeared on February 18 in the morning. In the evening, after unsuccessful attempts to solve the problem, I just closed the application. On the morning of February 19th, I opened the application again, and lo and behold, everything works, letters immediately loaded, sending also works. I don’t understand what was the cause of the problem, if it itself was solved, without my help. Many thanks to everyone who helped with the advice.