![]() You must therefore convince your security software to accept and rely on the most recent Thunderbird version. The new Thunderbird version might not be trusted by your firewall or antivirus software. The email program should be whitelisted if this issue started soon after you updated Thunderbird. Visit the official support website for your antivirus or firewall for thorough instructions. Add Thunderbird to the list by clicking the Allow another app option.ĭepending on the antivirus/firewall you’re running, there are different measures to take.Select “ Change settings” from the menu.Select Allow an app via firewall after that.Fill up the Windows search bar with “ firewall.”.If Windows Firewall is being used by you: To add or remove exclusions, choose Select Thunderbird, then add an exclusion.Then select Manage options under Virus & threat protection.Go to Windows Security under Settings Update & Security.If Windows Security is what you’re using: Whitelist Thunderbird if you can send and receive emails with the antivirus and firewall turned off. Simply disable the tools to see if your firewall or antivirus program is preventing outgoing emails. Alternatively, they can stop emails from reaching your inbox. Now double on the Thunderbird app by holding the Shift key. Thunderbird may not be able to deliver your mails because of your firewall or antivirus software. First, close the Thunderbird application if it was running in the background. ![]() Fix 1: Block Thunderbird or Turn Off Your Firewall and Antivirus Software ![]()
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