Savvy Sender is a subscription service, which is billed every thirty (30) days based on the peak number of contacts and peak amount of disk space during the previous thirty (30) day billing cycle or the selected plan, whichever is greater. All services and overages must be paid by credit card and are charged automatically.
If additional contacts are added beyond the number of contacts the current plan allows or additional disk space is used beyond the amount of disk space the current plan allows, then the account will automatically be upgraded and charged for the difference of the new plan and the existing plan.
Click here for the complete terms of service.