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Enable SSL Encryption for Thunderbird on Windows (IMAP)

Learn how to activate the SSL Encryption for Thunderbird on your Windows computer using IMAP.

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

In the main field, enter 993 next to 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 Local Folders menu and then select the auth.smtp.1and1.co.uk server and click Edit. Outgoing Server (SMTP) Settings
Outgoing Server (SMTP) Settings
Step 5
Select STARTTLS from the Connection security drop-down list. Click OK. Additional SMTP settings
Additional SMTP settings
Step 6
Click on OK to finish. Saved settings
Saved settings
For additional information, you may want to reference: