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Enable SSL Encryption for Thunderbird on Windows (POP3)

Find out how to activate SSL Encryption for Thunderbird on your Windows computer using POP3.

Step 1
Open Mozilla Thunderbird from your computer's Start-menu.
Step 2
Select your 1&1 Mail Basic account from the sidebar. Then, click View settings for this account. Thunderbird start page
Thunderbird start page
Step 3
Click Server Settings.

Enter 995 in the Port field and select SSL/TLS from the Connection Security drop-down menu. When finished, click OK.Your Server Settings
Your Server Settings
Step 4
Select Outgoing Server (SMTP) from the sidebar and then select the server and click Edit.Overview of Outgoing Server (SMTP) Settings
Overview of Outgoing Server (SMTP) Settings
Step 5
Select STARTTLS from the Connection security drop-down list.Further SMTP settings
Further SMTP settings
Step 6
Click on OK.Saved settings
Saved settings
For additional information, you may want to reference: