How the calculator handles each provider
| Traveling Mailbox | Chooses the lowest estimated eligible Basic, Extended or Small Business plan; models included page scans, envelope overages, $2/forwarding shipment, check-deposit fee, annual two-month discount, and your address surcharge. |
| iPostal1 | Chooses among Green, Blue, Silver and Gold; models $0.35 extra mail items and scan orders using the cheapest published individual/bundle combination, plus additional pages over 10 per scanned envelope. |
| Anytime Mailbox | Uses the published generic 30-item / 5-page offer and lets you replace the local plan price. Models $0.35 incoming overage, $0.50 scan-page overage, $10 additional recipients and $5 forwarding bundles. |
| PostScan Mail | Chooses Starter, Standard or Premium; annual plans use their higher published scan/recipient allowances. Models $0.50 extra mail, $2 additional open-and-scan requests, page charges above 10, extra recipients and per-item forwarding handling. |