Symptom: When logging in to the Web mail through the control panel, you may receive login error as if the webmail does not recognise your email account, despite having entered the correct email address and password.
Background: There is currently a bug on the control panel. It links only to the first mail server, and you will get the error if your email account is created on newer mail servers.
Solution: Login using http://mail.yourdomain.com instead of going through the control panel. If your domain name is not yet redelegated to Quadra Hosting, check which mail server you are on in the control panel. It should tell you the Mail server's ip address and you can use http://theip.add.ress/ instead.