How do I create an app-specific password for Thunderbird if my email provider requires it due to two-factor authentication?

The process varies depending on your email provider. Generally, you'll need to log in to your email account through a web browser. Navigate to the security settings or two-factor authentication settings. There should be an option to generate an 'app-specific password'. Give it a descriptive name (e.g., 'Thunderbird') and then copy the generated password. Use this password instead of your regular email password in Thunderbird's SMTP settings.