That’s why you need to get your security programs to recognize and trust the updated Thunderbird version. Your antivirus/firewall may not trust the new Thunderbird version. If this problem occurred shortly after you updated Thunderbird, whitelisting the email tool should fix it. For detailed instructions, go to your antivirus/firewall official support page. The steps to follow are different depending on the antivirus/firewall you’re using. Hit the Allow another app button and add Thunderbird to the list.Then click on Allow an app through firewall.Type ‘ firewall‘ in the Windows search box.Select Add or remove exclusions → Add an exclusion, and select Thunderbird.

Then click on Virus & threat protection → Manage settings.

Navigate to Settings → Update & Security → Windows Security.

If you can send and receive emails with the antivirus and firewall off, whitelist Thunderbird. To test if your antivirus or firewall is blocking outgoing emails, simply disable the tools. Or they could be blocking the emails coming to your inbox.

Your antivirus or firewall might be preventing Thunderbird from delivering your messages. Whitelist Thunderbird or Disable Your Antivirus/Firewall Select Server settings and make sure you’re using the correct IMAP Server settings.įor more information on the IMAP settings to use, go to the official webpage of your email account provider.Click on the three-lines to open the menu.If you’re using a different email service, go to your mail provider’s website and search for the SMTP mail settings to use.If you don’t know what SMTP settings to use, check Thunderbird’s support pages: Check the SMTP server settings for your email address.Launch Thunderbird and click on the menu.That’s why you need to make sure you’re using the correct SMTP server settings.Įnsure you’re not trying to send emails from Thunderbird using the SMTP server of another email service. Not using the correct SMTP settings may prevent you from sending emails using Thunderbird. The server then distributes them to the recipients. In other words, the emails you send are first collected by the SMTP server. The SMTP server (Simple Mail Transfer Protocol) plays the role of the mailman in the email world. Use this method if you can’t send emails. Cannot Send or Receive Emails on Thunderbird Check Your SMTP Server Settings

Thunderbird mail settings