T-Online Outlook 2010 retrieve
- Open Outlook and click "file" and "add account".
- It's a wizard window, where you can choose the Option "server settings or additional server types manually configure" and twice on "Next" button appears.

New E-Mail Account
Retrieval of E-mail messages via the Pop3 Protocol
- Your Name: desired name of the sender
- E-Mail address: your full e-Mail address
- Incoming mail server: securepop.t-online.de
- Outgoing mail server: securesmtp.t-online.de
- User Name: Your E-Mail Address
- Password: The Password Of Your Mail Account. Check the box "password", so you don't have to enter the password each Time.
- Make sure that the login Option, "on using secure password authentication" is enabled.
After clicking on the "More settings" to open another window.
- Select the tab "outgoing server" and activate the Option "The postau goose server (SMTP) requires authentication".
- Go to the tab "Advanced" and check "this Server requires an encrypted connection (SSL)".
- In the drop-down menu of the outgoing mail server, select "SSL".
- The Port of the incoming mail server (POP3) should be 995 and the outgoing server (SMTP) 25 or 587. If not, tap the digits simply.

SSL settings
T-Online: E-Mails via IMAP
If you don't want to use the POP3 Protocol, but IMAP, follow the same scheme as above. Change the following only:
- Incoming mail server: secureimap.t-online.de
- Port incoming mail: 993
Note: this manual applies to Microsoft Outlook 2010. In other versions, the procedure may be different.