For Web Hosting customers with a 1&1 IONOS email address.
This allows you to set up an individual signature for your emails:
Log in to WebMail.
Click the menu icon (System Menu) and then click Edit Settings.
Under Email > Signatures, click Add New Signature.
Enter a description, write the signature and specify where the signature is to be inserted. When you are done, click Save.
The signature is now automatically inserted when new emails are created.