Clear Locally Stored SSL Certificate

Windows

Follow these steps to delete the SSL certificate for your Windows email application:

1. Close your email application.
2. Go to the Start Menu and search for Internet Options.
3. In Internet Options, click Content.
4. Click Clear SSL State.
5. Re-open your email application.

Apple

Follow these steps to delete the SSL certificate for your Apple email application:

1. Close your email application.
2. Go to your Finder menu.
3. Click the Go menu and then select Utilities in the submenu.
4. Scroll down and open KeyChain Access.
5. In the left pane, click on login.
6. Right click on the the certificate named *.netcetera.co.uk
7. In the menu select Delete "*.netcetera.co.uk"
8. When prompted provide your password to authorize modifying the keychain.
9. After a brief wait, you should no longer see the certificate in the certificate list.