# Certificate warning in Email software
A certificate warning may be shown if the IP or domain you are connecting to does not match one of the SSL Certificates assigned to the server.
To eliminate the certificate warning, add a server domain to each server running the Email role and connect to the server domain when configuring your email software's incoming and outgoing server.
To add a server domain to a server:
- Open Servers in the left side bar
- Select the Server you would like to add an SSL to
- Select the three dots in the top right hand corner of the page and select Server domains from the drop down menu
- Navigate to Server domain input the server domain and click 'Add'