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To enable encryption (SSL/TLS) in Mozilla Thunderbird, proceed as follows:
Open Mozilla Thunderbird.
Press the Alt key.
Click Tools > Account Settings in the menu bar.
![](/help/fileadmin/images/Email/5147/EN/activating_ssl_tls_in_thunderbird_1.png)
In the navigation bar on the left, click the arrow that appears in front of the account name.
![](/help/fileadmin/images/Email/5147/EN/activating_ssl_tls_in_thunderbird_2.png)
Click Server Settings in the navigation bar on the left.
![](/help/fileadmin/images/Email/5147/EN/activating_ssl_tls_in_thunderbird_3.png)
In the Security Settings section, select SSL/TLS in the Connection Security list.
![](/help/fileadmin/images/Email/5147/EN/activating_ssl_tls_in_thunderbird_4.png)
In the Authentication method list, select Normal Password.
In the Server settings section, in the Port: field, enter port 993.
In the navigation bar on the left, click the arrow that appears in front of the Outgoing server (SMTP) menu item.
Double-click on the outgoing mail server smtp.ionos.com.
![](/help/fileadmin/images/Email/5147/EN/activating_ssl_tls_in_thunderbird_5_us.png)
In the Connection Security list, select SSL/TLS.
In the Authentication method list, select Normal Password.
In the Port: field, type port 465.
![](/help/fileadmin/images/Email/5147/EN/activating_ssl_tls_in_thunderbird_6.png)
Click OK.