3-Digit Presort

Learn what 3-Digit Presort means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

5-Digit Presort

Learn what 5-Digit Presort means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

A/B Testing

Learn what A/B Testing means for direct mail. A/B testing compares two versions of a direct mail campaign to see which performs better.

Address Autocomplete

Learn what Address Autocomplete means in direct mail and how it affects address quality, deliverability, and mailing accuracy.

Address Block

Learn what Address Block means for direct mail. The address block is the mailpiece area reserved for recipient and delivery information.

Address Change Service

Learn what Address Change Service means and how ACS helps mailers receive electronic address corrections when mail cannot be delivered.

Address Correction

Learn what Address Correction means for direct mail. Address correction fixes inaccurate, outdated, or incomplete addresses before mail is sent.

Address Hygiene

Learn what Address Hygiene means for direct mail. Address hygiene keeps mailing data clean, current, and ready for reliable campaign execution.

Address Metadata

Learn what Address Metadata means in direct mail and how it affects address quality, deliverability, and mailing accuracy.

Address Normalization

Learn what Address Normalization means in direct mail and how it affects address quality, deliverability, and mailing accuracy.

Address Parsing

Learn what Address Parsing means in direct mail and how it affects address quality, deliverability, and mailing accuracy.

Address Standardization

Learn what address standardization means, how it formats addresses for postal accuracy, and why it matters for direct mail deliverability.

Address Verification

Learn what address verification means and why accurate, deliverable addresses are essential for automated direct mail campaigns.

Address Verification APIs

Learn how Address Verification APIs help validate, standardize, and format mailing addresses inside forms, CRMs, apps, and direct mail workflows.

Analytics Dashboard

Learn how analytics dashboards help teams monitor direct mail delivery activity, campaign performance, operational trends, and results.

Ancillary Service Endorsement

Learn what Ancillary Service Endorsement means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

API-Driven Direct Mail

Learn how API-driven direct mail connects physical mail to CRMs, product workflows, marketing automation platforms, and customer data.

Area Distribution Center

Learn what Area Distribution Center means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Artificial Intelligence

Learn what Artificial Intelligence means in direct mail and how it affects automation, personalization, and workflow efficiency.

Attribution Window

Learn what Attribution Window means in direct mail and how it affects campaign measurement, attribution, and optimization.

Audience Segmentation

Learn how audience segmentation helps teams divide mailing lists into groups for more targeted and effective campaigns.

Automated Area Distribution Center

Learn what Automated Area Distribution Center means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Automation-Compatible Mail

Learn what Automation-Compatible Mail means for direct mail. Automation-compatible mail meets USPS requirements for efficient machine processing.

Barcode Clear Zone

Learn what Barcode Clear Zone means for direct mail. The barcode clear zone keeps required postal barcode areas free of design elements.

Basis Weight

Learn what Basis Weight means for direct mail. Basis weight describes paper weight and affects cost, feel, durability, and mailpiece eligibility.

Batching

Learn what Batching means for direct mail. Batching groups mailpieces together so they can be produced, processed, or mailed more efficiently.

Batch Mailing

Learn what Batch Mailing means for direct mail. Batch mailing sends groups of mailpieces together for scheduled or high-volume campaign execution.

Bleed

Learn what Bleed means for direct mail. Bleed is the extra artwork area that extends beyond the trim edge to prevent white borders.

Buck Slip

Learn what Buck Slip means for direct mail. A buck slip is a small insert used to highlight an offer, CTA, or supporting message.

Bulk Mail

Learn what Bulk Mail means for direct mail. Bulk mail refers to large-volume commercial mailings that may qualify for discounted postage.

Business Mail Entry Unit

Learn what Business Mail Entry Unit means for direct mail. A Business Mail Entry Unit is where commercial mailings are verified and accepted by USPS.

Business Reply Mail

Learn what Business Reply Mail means for direct mail. Business Reply Mail lets recipients respond without paying postage upfront.

Call to Action

Learn what Call to Action means for direct mail. A call to action tells the recipient what step to take after receiving a mailpiece.

Campaign Metadata

Learn what Campaign Metadata means for direct mail. Campaign metadata adds structured information to mail campaigns for reporting, tracking, and analysis.

Cancellation Window

Learn what Cancellation Window means for direct mail. A cancellation window is the period when a mailpiece can still be stopped before production begins.

Carrier Route

Learn what Carrier Route means for direct mail. A carrier route is the set of addresses served by a specific USPS mail carrier.

Carrier Route Presort

Learn what Carrier Route Presort means for direct mail. Carrier route presort groups mail by final delivery route to support postal efficiency.

CASS Certification

Learn what CASS Certification means and why USPS-certified address matching matters for postal accuracy and direct mail automation.

CMYK

Learn what CMYK means for direct mail. CMYK is the color model used in most commercial printing.

Commercial Mail Receiving Agency

Learn what Commercial Mail Receiving Agency means in direct mail and how it affects address quality, deliverability, and mailing accuracy.

Commingling

Learn what Commingling means for direct mail. Commingling combines mail from multiple senders to improve presort efficiency and postage optimization.

Compliance Mail

Learn what Compliance Mail means in direct mail and how it affects compliance, privacy, accuracy, and customer communications.

Control Group

Learn what Control Group means for direct mail. A control group helps marketers measure the incremental impact of a direct mail campaign.

Conversion Rate

Learn what Conversion Rate means for direct mail. Conversion rate measures the percentage of recipients who complete a desired action.

Cost Per Piece

Learn what Cost Per Piece means for direct mail. Cost per piece measures the total cost to produce and send one mailpiece.

Cost Per Response

Learn what Cost Per Response means for direct mail. Cost per response measures how much a campaign spends for each response generated.

Coupon Code

Learn what Coupon Code means for direct mail. A coupon code helps recipients redeem offers and helps marketers attribute campaign performance.

Courtesy Reply Envelope

Learn what Courtesy Reply Envelope means in direct mail and how it affects print production, design quality, and campaign execution.

Creative Versioning

Learn what Creative Versioning means in direct mail and how it affects automation, personalization, and workflow efficiency.

Customer Registration ID

Learn what Customer Registration ID means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Data Append

Learn what Data Append means for direct mail. Data append adds useful information to customer or prospect records for better targeting and personalization.

Deduplication

Learn what Deduplication means for direct mail. Deduplication removes duplicate records from a mailing list to reduce waste and improve customer experience.

Delivery Point

Learn what Delivery Point means for direct mail. A delivery point is the specific location where USPS delivers a mailpiece.

Delivery Point Barcode

Learn what Delivery Point Barcode means for direct mail. A delivery point barcode helps identify the final delivery location for a mailpiece.

Delivery Point Validation

Learn what Delivery Point Validation means and how DPV helps confirm whether an address is a valid USPS delivery point.

Destination Delivery Unit

Learn what Destination Delivery Unit means for direct mail. A Destination Delivery Unit is the local postal facility responsible for final delivery.

Destination Entry

Learn what destination entry means and how entering mail closer to its final destination can affect postal costs and delivery efficiency.

Destination Entry Discount

Learn what Destination Entry Discount means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Destination Sectional Center Facility

Learn what Destination Sectional Center Facility means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Die Cut

Learn what Die Cut means for direct mail. A die cut gives printed mailpieces a custom shape or cutout.

Digital Printing

Learn what Digital Printing means in direct mail and how it affects print production, design quality, and campaign execution.

Direct Mail

Learn what Direct Mail means for direct mail. Direct mail uses physical mail to reach people at home or at work.

Direct Mail Advertising

Learn what direct mail advertising means and how brands use targeted physical mail to promote offers, reach customers, and drive response.

Direct Mail Automation

Learn what direct mail automation means and how software helps teams create, personalize, send, and track mail at scale.

Direct Mail Campaign

Learn what a direct mail campaign is and how teams use mail to drive awareness, leads, retention, revenue, or customer action.

Direct Mail Format

Learn what Direct Mail Format means for direct mail. A direct mail format is the physical type of mailpiece used in a campaign.

Direct Mail Marketing

Learn what direct mail marketing is and how teams use automation, personalization, and measurement to improve campaign results.

Direct Mail Postcards

Learn what direct mail postcards are and how teams use personalized, trackable postcards in automated direct mail campaigns.

Direct Mail Printing

Learn what direct mail printing means and how campaign creative, customer data, templates, and workflows become physical mail.

Direct Mail Template

Learn what Direct Mail Template means for direct mail. A direct mail template is a reusable design or layout used to create mailpieces efficiently.

Drop Date

Learn what Drop Date means for direct mail. The drop date is when a mailpiece enters the mailstream or is handed off to USPS.

Duplex Printing

Learn what Duplex Printing means for direct mail. Duplex printing prints on both sides of a sheet or mailpiece.

Dynamic Template

Learn how dynamic templates use recipient data and business rules to personalize direct mail creative at scale.

Electronic Documentation

Learn what Electronic Documentation means for direct mail. Electronic documentation submits commercial mailing information to USPS digitally.

Enhanced Line of Travel

Learn what Enhanced Line of Travel means for direct mail. Enhanced Line of Travel helps sequence addresses in approximate carrier delivery order.

Entry Point

Learn what Entry Point means for direct mail. An entry point is where mail enters the USPS network for processing and transportation.

Envelope Teaser

Learn what Envelope Teaser means for direct mail. An envelope teaser is copy printed on the outside of an envelope to encourage opens.

Every Door Direct Mail

Learn what Every Door Direct Mail is and how EDDM helps businesses target geographic areas without a named mailing list.

First-Class Mail

Learn what First-Class Mail is and when teams use it for time-sensitive, important, transactional, or regulated communications.

Flat

Learn what Flat means for direct mail. A flat is a larger, flexible mailpiece such as a catalog, booklet, or oversized envelope.

Folded Self-Mailer

Learn what Folded Self-Mailer means for direct mail. A folded self-mailer is a folded and sealed mailpiece sent without an envelope.

Full-Service Intelligent Mail

Learn what Full-Service Intelligent Mail means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Geocoding

Learn what Geocoding means for direct mail. Geocoding converts mailing addresses into geographic coordinates.

Holdout Group

Learn what Holdout Group means for direct mail. A holdout group is intentionally excluded from a campaign to help measure incremental lift.

Householding

Learn what Householding means for direct mail. Householding groups people at the same address to reduce duplicate mail and improve targeting.

HTML Template

Learn what HTML Template means for direct mail. An HTML template uses code to generate personalized mailpieces at scale.

Indicia

Learn what Indicia means for direct mail. An indicia is a printed postage marking used instead of a stamp.

Informed Delivery

Learn what USPS Informed Delivery is and how it gives recipients a digital preview of incoming mail while extending campaign reach.

Informed Visibility

Learn what Informed Visibility means and how USPS scan data helps mailers monitor delivery progress and estimate in-home timing.

In-Home Date

Learn what In-Home Date means for direct mail. The in-home date is the estimated date a mailpiece is expected to arrive.

In-Home Window

Learn what In-Home Window means for direct mail. An in-home window is the expected delivery date range for a mail campaign.

Insert

Learn what Insert means for direct mail. An insert is an additional printed piece included inside a mail package.

Intelligent Direct Mail

Learn how intelligent direct mail uses data, automation, personalization, routing, and tracking to make physical mail more measurable.

Intelligent Mail Barcode

Learn what the Intelligent Mail barcode is and how it helps USPS sort, track, and process letters and flats.

Junk Mail

Learn what junk mail means and how modern direct mail uses targeting, personalization, timing, and measurement to improve relevance.

LACSLink

Learn what LACSLink means for direct mail. LACSLink helps identify addresses changed by local conversions, renaming, or emergency address updates.

Landing Page

Learn what Landing Page means for direct mail. A landing page connects a direct mail campaign to a dedicated digital experience.

Letter

Learn what Letter means for direct mail. A letter is an envelope-based mailpiece commonly used for personal, transactional, or regulated communications.

Letter Package

Learn what a letter package includes and why envelopes, letters, inserts, and reply devices are used for detailed communications.

Lifecycle Mail

Learn what Lifecycle Mail means for direct mail. Lifecycle mail is triggered by a customer’s stage, behavior, or relationship with a brand.

Lift

Learn what lift means and how marketers use control or holdout groups to measure the incremental impact of direct mail.

List Hygiene

Learn what List Hygiene means for direct mail. List hygiene keeps mailing lists accurate, current, and ready for delivery.

Machinable Mail

Learn what Machinable Mail means for direct mail. Machinable mail meets USPS requirements for processing on automated or mechanized equipment.

Mail Class

Learn what Mail Class means for direct mail. A mail class is a USPS service category with specific pricing, speed, and preparation rules.

Mailer ID

Learn what Mailer ID means for direct mail. A Mailer ID identifies a mail owner or mailing agent within USPS systems.

Mail Growth Incentive

Learn what Mail Growth Incentive means for direct mail. A Mail Growth Incentive encourages eligible mailers to grow qualifying mail volume above a baseline.

Mailing List

Learn what a mailing list is and how audience data, address quality, segmentation, and suppression affect campaign performance.

Mail Merge

Learn what Mail Merge means for direct mail. Mail merge inserts recipient-specific data into a mail template.

Mail Owner

Learn what Mail Owner means for direct mail. The mail owner is the brand or organization on whose behalf a mailing is sent.

Mailpiece

Learn what Mailpiece means for direct mail. A mailpiece is an individual item sent through the mail.

Mailpiece-Level Tracking

Learn what Mailpiece-Level Tracking means for direct mail. Mailpiece-level tracking shows the status of each individual mailpiece.

Mail Service Provider

Learn what Mail Service Provider means for direct mail. A mail service provider helps prepare, produce, process, or enter mail into the postal network.

Matchback Analysis

Learn how matchback analysis connects direct mail recipients to later purchases, applications, demo requests, or other conversions.

Metered Mail

Learn what Metered Mail means for direct mail. Metered mail uses a postage meter or approved system to print postage.

Mixed AADC

Learn what Mixed AADC means for direct mail. Mixed AADC groups mail for multiple Automated Area Distribution Centers.

Move Update

Learn what Move Update means for direct mail. Move Update helps ensure mailing lists reflect recent customer address changes.

National Change of Address

Learn what NCOA means and how National Change of Address processing helps update mailing lists and reduce undeliverable mail.

Nixie

Learn what Nixie means for direct mail. A nixie is mail that USPS cannot deliver as addressed.

Nonmachinable Mail

Learn what Nonmachinable Mail means for direct mail. Nonmachinable mail cannot be processed on standard automated USPS equipment.

No-Stat Address

Learn what No-Stat Address means for direct mail. A no-stat address appears in USPS data but is not currently receiving regular delivery.

Offer Code

Learn what Offer Code means for direct mail. An offer code helps recipients redeem promotions and helps marketers track campaign response.

Offset Printing

Learn what Offset Printing means for direct mail. Offset printing is a commercial print method often used for high-volume print runs.

Omnichannel Marketing

Learn what Omnichannel Marketing means for direct mail. Omnichannel marketing coordinates direct mail with digital and offline customer touchpoints.

One-to-One Personalization

Learn what One-to-One Personalization means for direct mail. One-to-one personalization customizes a mailpiece for an individual recipient.

Outer Envelope

Learn what Outer Envelope means for direct mail. An outer envelope contains and protects a letter package while influencing whether it gets opened.

Paper Finish

Learn what Paper Finish means for direct mail. Paper finish describes the surface feel or coating of a printed mailpiece.

Paper Stock

Learn what Paper Stock means for direct mail. Paper stock is the paper or cardstock used to produce a mailpiece.

PAVE Certification

Learn what PAVE Certification means for direct mail. PAVE Certification evaluates whether presort software meets USPS preparation standards.

Perforation

Learn what Perforation means for direct mail. A perforation creates an easy-tear section on a printed mailpiece.

Permit Imprint

Learn what Permit Imprint means for direct mail. A permit imprint is a printed postage mark used for commercial mailings.

Personalized URL

Learn what a personalized URL is and how PURLs connect direct mail recipients to tailored digital experiences and campaign tracking.

Personally Identifiable Information

Learn what Personally Identifiable Information means for direct mail. Personally Identifiable Information is data that can identify an individual.

Postage Optimization

Learn what postage optimization means and how presort, commingling, address quality, entry points, and mail class affect costs.

Postal Logistics

Learn how postal logistics affects direct mail routing, preparation, handoff, delivery visibility, cost control, and speed.

Postal Presort

Learn what postal presort means and how sorting mail before USPS entry can improve efficiency and reduce postage costs.

Postcard

Learn what a postcard is and why this envelope-free format is commonly used for visible, cost-efficient direct mail campaigns.

Print Delivery Network

Learn how a distributed Print Delivery Network can improve direct mail speed, scalability, resilience, and delivery consistency.

Print-Ready File

Learn what Print-Ready File means for direct mail. A print-ready file is prepared with the correct specs for production.

Processing & Distribution Center

Learn what Processing & Distribution Center means in direct mail and how it affects USPS processing, delivery timing, and postage costs.

Production Tracking

Learn what production tracking means and how teams monitor mail as it moves through creation, printing, quality checks, and USPS handoff.

Proof

Learn what Proof means for direct mail. A proof is a preview or sample used to check a mailpiece before production.

QR Code

Learn how QR codes connect physical mailpieces to digital destinations like landing pages, payments, scheduling, and campaign tracking.

Residential Delivery Indicator

Learn what Residential Delivery Indicator means and how RDI helps identify whether an address is residential or business.

Resolution

Learn what Resolution means for direct mail. Resolution measures image detail and affects print clarity.

Response Rate

Learn what response rate means in direct mail and how it measures the percentage of recipients who take action after a campaign.

Return Address

Learn what Return Address means for direct mail. A return address tells USPS where undeliverable mail should be sent.

Returned Mail Processing

Learn what Returned Mail Processing means for direct mail. Returned mail processing helps teams track undeliverable mail and update customer records.

Return Mail

Learn what return mail is, why mail is sent back, and how returned mail data can improve address hygiene and future campaigns.

Return on Ad Spend

Learn what ROAS means and how direct mail teams compare attributed revenue to campaign spend.

Return on Investment

Learn what ROI means in direct mail and how teams evaluate whether campaign revenue or value justifies total cost.

Return on Marketing Investment

Learn what ROMI means and how teams measure direct mail return against production, postage, data, creative, and platform costs.

Safe Zone

Learn what Safe Zone means for direct mail. The safe zone keeps important design elements away from trim edges and postal areas.

Saturation Mailing

Learn what Saturation Mailing means for direct mail. Saturation mailing targets most or all addresses within a defined geographic area.

Scan Rate

Learn what Scan Rate means for direct mail. Scan rate measures how many recipients scan a QR code or similar trackable element.

Scoring

Learn what Scoring means for direct mail. Scoring creates a crease so printed pieces fold cleanly.

Sectional Center Facility

Learn what Sectional Center Facility means for direct mail. A Sectional Center Facility is a USPS processing facility serving a defined ZIP Code area.

Seed List

Learn what Seed List means for direct mail. A seed list lets internal or test recipients monitor campaign production and delivery.

Segmentation

Learn what segmentation means and how grouping audiences by traits, behavior, lifecycle stage, or geography improves direct mail.

Self-Mailer

Learn what a self-mailer is and how folded, envelope-free mailpieces can provide more creative space than postcards.

Service Standard

Learn what Service Standard means for direct mail. A service standard is the expected USPS delivery timeframe for a mail class or route.

Service Type Identifier

Learn what Service Type Identifier means for direct mail. A Service Type Identifier tells USPS the mail class and services requested for a mailpiece.

Simplex Printing

Learn what Simplex Printing means for direct mail. Simplex printing prints on only one side of a sheet or mailpiece.

Sortation

Learn what Sortation means for direct mail. Sortation organizes mail by destination or USPS preparation rules.

Source Code

Learn what Source Code means for direct mail. A source code helps attribute responses to a campaign, offer, or segment.

Standard Mail

Learn what Standard Mail means, why the term is still used, and how it relates to USPS Marketing Mail today.

Suppression List

Learn what a suppression list is and how excluding ineligible people or addresses can reduce waste and improve customer experience.

Tabbing / Wafer Tab

Learn what Tabbing / Wafer Tab means for direct mail. Tabbing seals folded self-mailers so they stay closed during processing.

Targeting

Learn what Targeting means for direct mail. Targeting selects the people, households, businesses, or geographies that should receive a campaign.

Test-and-Control

Learn how test-and-control groups help measure whether direct mail drove incremental results beyond normal customer behavior.

Transactional Mail

Learn what Transactional Mail means for direct mail. Transactional mail includes required or account-based communications sent to customers.

Triggered Direct Mail

Learn what Triggered Direct Mail means in direct mail and how it affects automation, personalization, and workflow efficiency.

Trigger Event

Learn what Trigger Event means for direct mail. A trigger event is the action or data signal that starts an automated mail send.

Trim Line

Learn what Trim Line means for direct mail. The trim line shows where a printed piece will be cut to final size.

Undeliverable as Addressed

Learn what Undeliverable as Addressed means, why UAA mail happens, and how address quality can reduce failed delivery.

USPS Certified Mail

Learn what USPS Certified Mail is and how proof of mailing and delivery supports legal, financial, healthcare, and compliance communications.

USPS Marketing Mail

Learn what USPS Marketing Mail is and why it is used for promotional, advertising, and less time-sensitive direct mail.

USPS Promotions

Learn what USPS Promotions means for direct mail. USPS Promotions offer limited-time postage discounts for qualifying mail techniques or formats.

Vacant Address

Learn what Vacant Address means for direct mail. A vacant address is not currently occupied or receiving regular delivery.

Variable Data Printing

Learn what variable data printing means and how it enables personalized direct mail with dynamic text, images, offers, and recipient data.

Variable Field

Learn what Variable Field means for direct mail. A variable field is a placeholder filled with recipient-specific data.

Variable Logic

Learn what Variable Logic means for direct mail. Variable logic determines which content appears based on recipient data or campaign rules.

Webhook

Learn what Webhook means for direct mail. A webhook sends an automated event notification from one system to another.

Window Envelope

Learn what Window Envelope means for direct mail. A window envelope shows the recipient address through a transparent opening.

Workshare Discount

Learn what a workshare discount is and how mail preparation, sorting, and transportation can reduce postage costs.

ZIP+4

Learn what ZIP+4 means for direct mail. ZIP+4 adds four digits to a ZIP Code for more precise delivery information.