1) Connect to the server you are working with using a remote desktop program of your choice and launch IIS.

2) Click the dropdown arrow next to the server name on the left to expand it then click the dropdown arrow for Sites.

3) Right click SmarterMail and click Edit Bindings.

4) Find the domain that you want to remove with port 443, select it, then click Remove.

5) Repeat step 4 but with port 80.

6) Navigate to Certify The Web and find the certificate that contains the domain you are working with.

7) Click Certificates on the right side of the screen, find the domain that you want to remove, then click the trash can icon next to the domain.

8) Click Save at the top of the screen to save the changes.