SSL encryption in Thunderbird in four steps
- First of all, click on the Email account and go to the "account settings".
- In the menu "account settings" choose the "Server settings".
- Under the "Server settings" in the group "security and authentication" and select in the pull-down list next to "connection security", select "SSL/TLS".
- Finally, confirm your selection with "OK" and you have enabled secure SSL encryption.

SSL/TLS for Mozilla Thunderbird
So you don't drown in E-Mail Chaos you can in Mozilla Thunderbird using Filters for order and, above all, for Overview. How you can quickly and easily Filter, create, learn in the article "Thunderbird: create a Filter – so's".