Try briefly turning off antivirus, VPN, proxy and firewall software, check for new email, and turning them on and check again for email.Verify that your incoming email is not being blocked by your firewall, VPN, proxy, antivirus software (which sometimes implements a proxy and intercepts email) or your Internet Service Provider: Verify that your incoming email is not being blocked Automatic Account Configuration (for creating a new account).Manual Account Configuration (for instructions on using the New Account dialog for manual configuration).Make sure your account settings match these settings. Your email account provider can give you connection information about their servers (probably on their website). The connection to the incoming mail server is configured at the top of the page on the right. To look at the settings for an account, select Tools Edit > Account Settings in the Thunderbird menu bar, or click the Application menu button and select Options Preferences and Account Settings from the sub-menu, then select Server Settings for the account name from the list on the left. More details and instructions at Thunderbird 78 FAQ. You can temporarily lower the bar to check if this is the reason for your problem (which obviously reduces security, so it is not recommended). If your provider does not support the newer versions of the protocol, sending and receiving of messages may fail. Thunderbird 78 expects higher security standards for the so-called TLS network encryption protocol. The problem suddenly started after updating to Thunderbird version 78. 6 Are you exceeding mail provider access limits?.5 Are you receiving some emails but not others?.

4 Did your ability to receive mail suddenly stop? Was it working before?.

3 Verify that your incoming email is not being blocked.

2 Is your account configured correctly?.1 The problem suddenly started after updating to Thunderbird version 78.

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