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Mailing guides
USPS Mail Classes Explained: First-Class vs Marketing Mail · Postcard, Letter, Flat, or Parcel: USPS Size Limits · Folded Self-Mailers and Tabbing Requirements · Mailing Booklets: Size, Spine, and Tabbing Rules · Automation and Presort: How to Earn the Lowest Postage · Carrier Route Density: Basic, High Density, and Saturation · Addressing, CASS, and Move Update Requirements · How to Prepare a Mailing List for Bulk Mail · Designing Artwork That Mails Correctly · EDDM: Every Door Direct Mail Requirements · Drop Shipment and Destination Entry Discounts · USPS Delivery Times by Mail Class · Shipping Parcels: Ground Advantage, Priority, and Express · USPS Extra Services: Certified, Registered, and Tracking · Reply Mail: Courtesy, Business, and Qualified Business Reply · Postage Payment, Permits, and Indicia for Bulk Mail · Intelligent Mail Barcode and Informed Delivery · Nonprofit Mail: Who Qualifies and How to Get Authorized · Political Mail and Official Election Mail
Articles & how-to
Direct Mail Ideas and Campaign Examples That Get a Response · Direct Mail Formats: The Main Types and How to Choose · Yard Signs and Door Hangers for Political Campaigns in 2026 · Political Mail in 2026: Planning a Winning Campaign Mailing · How to choose between EDDM and a targeted mailing list · How to prepare a mailing list for a bulk mailing · USPS 2026 Delivery Standards: Planning Your Drop Date
Case studies
Ten lists mailed. Then the strategy changed. · The EDDM mailing reached the wrong city. The list missed thousands in the right one. · The new CA-08 crossed five counties, and one number had to be right.
Postal encyclopedia
AADC · ACS · Address Block · Alternative Address Format · Ancillary Service Endorsement · Automation Rate · BMEU · CASS · Carrier Route Basic · Carrier Route · CRID · DDU · DSCF · eDoc · EDDM · eInduction · Facing Identification Mark · Flat · Folded Self-Mailer · Full-Service IMb · High Density · High Density Plus · IMb · Indicia · Informed Delivery · LACSLink · Letter · Mail.dat · Mailer ID · Marketing Mail · Move Update · NCOA Link · Nonautomation · Nonprofit Marketing Mail · OCR Read Area · Permit Imprint · Phoenix Flats Stacker · Plavidian Insight™ Piece Tracking · Postage Statement · Presort · PRSRT STD · Return Service Requested · Ride-Along Image · SCF · Seamless Acceptance · Seed List · Single-Piece · Saturation · Tabbing · Camera Verification · UAA · ZIP+4