I would like to bill my clients for spam filtering per email address. Anybody know if one of the billing programs out there can add-on packages to hosting by quantity?
For example, standard hosting ($x) + 32 email addresses with spam filtering (32 x $y).
I would prefer to use WHMAutoPilot, ClientExec, or Whois.Cart, but am willing to hear other suggestions.
Yes, Ubersmith is a billing script. www.ubersmith.com. Also, as Karthick said, ModernBill can bill by quantity, the thing is, your going to spend about a week trying to configure that sucker, but it's a good application.
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