Sending PoliteMail (1to1 with Tracking) consumes 1 send credit per recipient per message. No send credits are used for any of your regular Outlook email. The PoliteMail system may be used as an Internet Service (online application) or with the Outlook Add-in Software connected to a PoliteMail Server. Once you own the software license, your only ongoing costs are for send credits to cover the costs of maintaining the PoliteMail Server Cloud, which tracks email interactions continuously, even when your Outlook is closed.
PoliteMail Corporate Accounts and Enterprise Server installations with dedicated PoliteMail Servers do not use the send credits system.