Add as TLS-authenticated host

A server is considered a corporate email server if it performs TLS authentication with a client certificate during the connection. If a root or intermediate certificate is entered here, the server must log on with a certificate that contains the configured certificate in its certificate chain. If an end certificate is entered, the server must log on with this exact certificate.

1. Go to Configuration > Email routing > Corporate email servers.
2. Click Add.
3. Select With a TLS client certificate and click Next.
   
4. Click Select Certificate and highlight the certificate you want to use for authentication.
   
5. Click Select and Close and in the next dialog box click Next.
6. Determine which corporate domains are assigned to the server and click Next.
   
   
7. Enter a comment if required and click Finish.