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You can access our Basic Webmail client (Atmail) by going to:
https://webmail.emailarray.com
We're currently beta testing AfterLogic WebMail Pro, which might become our new default WebMail for basic accounts.
You can test it at https://al.emailarray.com and please give us your feedback. A video tutorial is available here.
Alternatively, we also offers several light-weight open-source webmail clients:
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Horde/IMP: https://horde.emailarray.com
You can choose your preferred Default WebMail in Domains > Edit section of the Admin Panel, assuming that you have pointed the webmail CNAME properly.