You can access webmail on the following addresses:
http://www.yourdomain.com:2095
or
http://www.yourdomain.com/webmail
or
http://www.abscomms.net:2095
When prompted for your username, enter your email address in lowercase, then enter your password.
You will be asked which webmail client to use. Each webmail client has access to the same mail data, so you can chose the mail client based on your personal preference.