Using the Server ­Console : Mail Manager : Configuring Email Notifications
   
Configuring Email Notifications
Cumulus sends email notifications for certain events, such as password changes, Web down- and uploads. To administer these various email notifications Cumulus provides templates and template classes – one class for each situation that can trigger an email notification. The general layout (including header and footer) is defined by a theme. An email template defines the subject and text body.
How Does it Work
Notification emails can be sent with, or without employing the theme. If the theme is used, Cumulus assembles the entire email by putting the appropriate body text, as defined in the template, in between the header and footer texts, as defined in the theme.
Notification emails can be sent either in HTML format, or as plain text mails. If you prefer HTML mails, make sure that the entire mail is enclosed between the <html> and </html> tags. This means:
Using the theme: header text must start with <html>, footer text must end with </html>
Without theme: body text must start with <html> and end with </html>