PostalForm mailing resources

• Can Certified Mail be sent to a PO Box? — Updated October 15, 2026. Yes.
• Cancel by mail: membership and subscription directory — Updated October 15, 2026. Find verified cancellation instructions, recipient rules, and guided letters.
• Certified Mail cost in 2026 — Updated October 15, 2026. Certified Mail cost is the postage for your mailpiece plus the USPS Certified Mail extra-service fee.
• Certified Mail forms: PS Form 3800, 3811, and 3817 — Updated October 15, 2026. The Certified Mail form most people need is USPS PS Form 3800, the Certified Mail receipt and barcode label used for domestic Certified Mail.
• Certified Mail Return Receipt: electronic signature record or green card? — Updated October 15, 2026. A Return Receipt is an optional USPS service used with Certified Mail to give the sender evidence of delivery, including signature information and the actual delivery address.
• Certified vs Registered Mail (security, speed, and cost) — Updated October 15, 2026. Certified Mail and Registered Mail both create USPS documentation, but they are built for different risk profiles.

• Best way to mail a PDF online — Compare the choices that matter when a finished document needs to become physical mail.
• Certified Mail online services and alternatives — Choose between a managed print-and-mail service, an office workflow, and a Certified Mail label tool.
• How to mail a letter from your phone — Prepare, review, and send a letter without a computer, printer, envelopes, or stamps.

• How long Certified Mail takes — Separate production time, USPS transit estimates, delivery attempts, and Return Receipt timing.
• Certified Mail cost breakdown — Understand postage, USPS extra-service fees, and the price of an online fulfillment service.
• Certified Mail Return Receipt — Decide when a signature record is useful and how electronic and hard-copy receipts differ.
• Certified Mail vs. Registered Mail — Compare proof, handling, insurance, and the jobs each USPS service is designed for.

• Demand letter resources — Payment demands, final notices, contractor claims, and guided letter workflows.
• Turn an unpaid invoice into a Certified Mail demand — Build a documented payment-demand packet from an invoice.
• Mail an invoice online — Send a finished invoice or statement without handling printing and envelopes in-house.
• Landlord notice workflows — Prepare and mail common property-management notices and packets.
• Bulk mail — Personalize and send one document to many recipients from a CSV.

PostalForm provides document and mailing tools, not legal advice. Confirm the recipient, deadline, required delivery method, and governing rules for any legal or official notice.

• Guided forms catalog — Complete, preview, and mail supported government, dispute, tax, and notice workflows.
• Dispute mail — Credit-report, billing, debt-validation, and written dispute resources.
• Tax forms and letters — Mailing workflows for supported IRS forms, elections, and responses.
• Court forms and filings — Prepare printable packets and follow the receiving court's filing instructions.
• Consumer complaint and credit-report guides — Written requests, disputes, and documentation-oriented workflows.

• PostalForm Projects — Add letters and postcards to an application with test and live API keys, final-price quotes, idempotent sends, tracking, and signed webhooks.
• Hosted checkout and MCP mail flows — Create reviewable drafts and return checkout URLs when a person should approve and pay.
• Send physical mail from an AI agent — Choose a safe human-review or explicitly authorized machine-payment path.
• Developer documentation — Review the available REST, MCP, agent, discovery, and payment surfaces.

PostalForm Projects can also be provisioned through Stripe Projects with a single command.

See supported countries and local mailing options for letters sent to the United States, Canada, Austria, Belgium, Switzerland, Germany, Spain, France, the United Kingdom, India, Luxembourg, and the Netherlands. Available tracking, signature, registered, and expedited options vary by destination.

• Mailing price calculator — Estimate fulfillment cost by page count, print settings, destination, and delivery options.
• Free PDF editor — Add text, signatures, images, or corrections before downloading or mailing a document.
• Merge PDFs — Put a letter, form, and exhibits into one ordered packet.
• Split a PDF — Extract the pages you need before sending.
• Delivery times — Review production and carrier estimates before choosing a service level.

• PostalForm online mailing data: H1 2026 order patterns — Aggregate, privacy-preserving patterns from paid PostalForm orders.
• Best online print-and-mail services — Compare providers by workflow rather than treating every service as interchangeable.
• PostalForm alternatives — Decide which type of mailing product best fits a one-off sender, team, or developer.
• Mailform alternative — Compare browser-based document mailing workflows.
• Click2Mail alternatives and LetterStream alternatives — Compare consumer-friendly and business-mail options.

This page is intentionally curated. For the complete machine-readable list of public articles and mailing guides, use the PostalForm article index.