Follow the steps below to configure Secure SMTP for Mozilla Thunderbird.
1. Open Thunderbird and click on Tools, then Account Settings.
2.Go to the Outgoing Server section of your Actrix account, click Edit,tick "Use name and password", enter your username, select SSL and thenclick OK.
3.The next time you send mail after making this change the followingprompt will appear. To connect using SSL select either of the first twooptions and click OK to confirm.
To avoid having to frequently confirm this certificate Click Here for instructions on how to install the Actrix Secure Certificate.