If we are trying to read webmail from our web browser, Firefox here (by default, using a secure connection, https ), we must accept some security warnings before we can log in. Let's see them.
1. In the address bar of your browser (not at search bar!!!) type: yourdomain.tpl/webmail (for example, calbasi.net/webmail
2. You get this screen:
You should choose "Understand the Risks" (remember, is YOUR domain ;-) Yes, you have not pay for a third part certification!
3. Then, you must "Add exception"
4. And you get this screen:
You must choose "Confirm Security Exception"
5. After it, at last, you get the login screen:
Enter your email address at "User Name" field, and password, and you get in your webmail client!!