RelayPost is the fastest way to send USPS Certified Mail online — no account, no subscription, no trip to the post office. Built for individuals and businesses who need legal proof of delivery: demand letters, IRS correspondence, lease notices, legal filings, debt validation, and more. Upload your document, enter a recipient address, and check out in under 60 seconds. We handle printing, enveloping, and mailing through our certified fulfillment partner — typically dispatched within one business day. Proudly based in Michigan and serving all 50 states, every order includes a real USPS tracking number sent to your inbox. Choose from three service levels: standard certified mail, certified mail with Electronic Return Receipt, or certified mail with a physical green card — the same options as the post office, without the wait. Transparent pricing: $19–$29 per letter based on service level. No hidden fees, no recurring charges. Pay once, send once. RelayPost makes certified mail simple.