USPS Postmark vs Proof of Mailing: 2026 Rules
A USPS postmark doesn't prove when you mailed it. Learn the real USPS postmark meaning in 2026 and how to get proof of mailing date.
By Postmarkr Team
Blog
Tips, guides, and insights about sending physical mail online.
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Informed Delivery Performance Benchmarks: Click Rates, Open Rates, and What to Expect
Data-driven analysis of USPS Informed Delivery campaign performance. Actual benchmarks for open rates, click-through rates, and how to evaluate ROI for your direct mail.
By Postmarkr Team
How to Set Up Your First USPS Informed Delivery Campaign: A Step-by-Step Guide
Practical walkthrough for creating Informed Delivery campaigns. From Business Customer Gateway registration to campaign submission, learn the exact process.
By Postmarkr Team
USPS Informed Delivery Postage Discounts: How to Save on Direct Mail Campaigns
Guide to USPS mailing promotions that include Informed Delivery discounts. Learn eligibility requirements, registration process, and how to maximize postage savings.
By Postmarkr Team
Informed Delivery Image Specifications: Ride-Along vs Representative Images Explained
Complete guide to USPS Informed Delivery image requirements. Learn exact dimensions, formats, and design best practices for ride-along and representative campaign images.
By Postmarkr Team
How Long Does Certified Mail Take to Deliver?
USPS certified mail typically takes 1-the upper end of the USPS 1-5 day window. Learn what affects delivery time, how to track your letter, and what happens if delivery is delayed.
By Nathan Crank
What Happens If Certified Mail Is Refused or Unclaimed
Learn what happens when certified mail is refused, returned unclaimed, or not delivered. Understand your options and the legal implications of failed delivery.
By Nathan Crank
Electronic Certified Mail: What It Documents and Legal Caveats
What electronic certified mail means and what it documents and key legal caveats. Covers USPS Electronic Return Receipt, online mailing services, and court acceptance.
By Postmarkr Team
Informed Delivery Technical Requirements: IMb, Mailer ID, and What You Actually Need
Plain-English guide to USPS Informed Delivery requirements. Understand Intelligent Mail barcodes, Mailer IDs, Full-Service mail, and the infrastructure needed to run campaigns.
By Postmarkr Team
Electronic Return Receipt vs Green Card: Which to Choose
Compare USPS electronic return receipt and physical green card options for certified mail. Learn the cost difference, delivery times, and which works best.
By Nathan Crank
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