This article explains how to manually set up an email account in the free email client Mozilla Thunderbird (version 78.3.3).

Please Note
  • The setup steps described in this article were created with Thunderbird version 78.3.3 as an example. If you are using a different version, the actual steps may differ slightly. You can find instructions for Mozilla Thunderbird version 102.12.0 in the following article: Setting up an email account manually with Mozilla Thunderbird (version 102.12.0)

  • To determine the version of Thunderbird installed on your computer, click Help > About Thunderbird on the Thunderbird menu bar.


  • Open Mozilla Thunderbird.

  • Click Local Folders in the navigation bar on the left.

  • In the Set Up Another Account section, click Email.

  • Enter your name, email address, and the password for your email address. Forgot your password?
  • Click Configure Manually.
  • Additional settings will be displayed. To configure your account for the IONOS email servers, enter/select the following settings:
  Type Server Address Port SSL Authentication
Incoming IMAP 993 SSL/TLS Normal password
Outgoing SMTP 587 STARTTLS Normal password

Alternatively, if you want to retrieve your emails using POP3, enter the following settings for the incoming mail server:

  Type Server Address Port SSL Authentication
Incoming POP3 993 SSL/TLS Normal password
  • Make sure your full email address has been entered in the Username fields and click Done.

Your account is now set up. To retrieve your emails, click on Inbox in the navigation bar on the left.

  • If you receive an error message when you try to set up your email account, see the following article for possible causes and solutions:

    Email Client Setup Failure

  • If you receive a server error when sending email, open the account's settings in Thunderbird and change the port and SSL settings for the outgoing mail server.

The following are the alternative settings for the outgoing mail server:

  Type Port SSL Authentication
Outgoing SMTP 465 SSL/TLS Normal password