Direct mail marketing glossary

3-digit presort groups mail by the first three digits of a ZIP Code to support more efficient regional processing.

5-digit presort groups mail by full ZIP Code to improve postal efficiency and support potential postage savings.

A/B testing compares two versions of a direct mail campaign to see which performs better.

Address autocomplete helps users enter accurate mailing addresses before bad data enters your systems.

The address block is the mailpiece area reserved for recipient and delivery information.

Address Change Service helps mailers receive updated address information when recipients move or mail cannot be delivered.

Address correction fixes inaccurate, outdated, or incomplete addresses before mail is sent.

Address hygiene keeps mailing data clean, current, and ready for reliable campaign execution.

Address metadata adds useful context to an address, such as delivery indicators, carrier route, or residential status.

Address normalization converts addresses into a consistent format for cleaner data and better matching.

Address parsing breaks a mailing address into individual components so it can be verified and standardized.

Address standardization formats mailing addresses according to postal standards before mail is sent.

Address verification checks whether a mailing address is complete, accurate, and deliverable.

Address Verification APIs help verify and format mailing addresses automatically inside digital workflows.

An analytics dashboard gives teams visibility into direct mail performance, delivery activity, and campaign trends.

An ancillary service endorsement tells USPS how to handle mail that cannot be delivered as addressed.

API-driven direct mail lets teams create, personalize, send, and track mail through software integrations.

An Area Distribution Center is a USPS facility that helps process mail across groups of ZIP Codes.

Artificial intelligence can help teams analyze data, personalize campaigns, and automate direct mail workflows.

An attribution window defines how long after delivery a response may be credited to a direct mail campaign.

Audience segmentation divides a mailing list into groups so campaigns can be more targeted and relevant.

An Automated Area Distribution Center supports automated mail sorting and presort preparation.

Automation-compatible mail meets USPS requirements for efficient machine processing.

The barcode clear zone keeps required postal barcode areas free of design elements.

Basis weight describes paper weight and affects cost, feel, durability, and mailpiece eligibility.

Batching groups mailpieces together so they can be produced, processed, or mailed more efficiently.

Batch mailing sends groups of mailpieces together for scheduled or high-volume campaign execution.

Bleed is the extra artwork area that extends beyond the trim edge to prevent white borders.

A buck slip is a small insert used to highlight an offer, CTA, or supporting message.

Bulk mail refers to large-volume commercial mailings that may qualify for discounted postage.

A Business Mail Entry Unit is where commercial mailings are verified and accepted by USPS.

Business Reply Mail lets recipients respond without paying postage upfront.

A call to action tells the recipient what step to take after receiving a mailpiece.

Campaign metadata adds structured information to mail campaigns for reporting, tracking, and analysis.

A cancellation window is the period when a mailpiece can still be stopped before production begins.

A carrier route is the set of addresses served by a specific USPS mail carrier.

Carrier route presort groups mail by final delivery route to support postal efficiency.

CASS Certification helps ensure address-matching software meets USPS accuracy standards.

CMYK is the color model used in most commercial printing.

A Commercial Mail Receiving Agency receives mail on behalf of customers at a private mailbox location.

Commingling combines mail from multiple senders to improve presort efficiency and postage optimization.

Compliance mail includes required or regulated communications that must be accurate, timely, and trackable.

A control group helps marketers measure the incremental impact of a direct mail campaign.

Conversion rate measures the percentage of recipients who complete a desired action.

Cost per piece measures the total cost to produce and send one mailpiece.

Cost per response measures how much a campaign spends for each response generated.

A coupon code helps recipients redeem offers and helps marketers attribute campaign performance.

A courtesy reply envelope makes it easier for recipients to mail something back at their own postage cost.

Creative versioning creates different mailpiece versions for different audiences, offers, or campaign rules.

A Customer Registration ID is a USPS identifier used for commercial mailing accounts and documentation.

Data append adds useful information to customer or prospect records for better targeting and personalization.

Deduplication removes duplicate records from a mailing list to reduce waste and improve customer experience.

A delivery point is the specific location where USPS delivers a mailpiece.

A delivery point barcode helps identify the final delivery location for a mailpiece.

Delivery Point Validation checks whether an address exists as a valid USPS delivery point.

A Destination Delivery Unit is the local postal facility responsible for final delivery.

Destination entry moves mail closer to its final destination before USPS handles the last stages of delivery.

A destination entry discount rewards eligible mail entered closer to where it will be delivered.

A Destination Sectional Center Facility is a USPS facility used in destination-entry and drop-shipping strategies.

A die cut gives printed mailpieces a custom shape or cutout.

Digital printing prints directly from a digital file and supports fast, personalized direct mail production.

Direct mail uses physical mail to reach people at home or at work.

Direct mail advertising uses physical mail to promote products, services, offers, or messages to a targeted audience.

Direct mail automation uses software to create, personalize, send, and track mail at scale.

A direct mail campaign is a coordinated mailing effort designed to drive a specific business outcome.

A direct mail format is the physical type of mailpiece used in a campaign.

Direct mail marketing uses physical mail to engage, convert, retain, or reactivate customers and prospects.

Direct mail postcards are envelope-free mailpieces used for quick, visible, and cost-efficient campaigns.

Direct mail printing turns campaign creative and customer data into physical mailpieces ready for production and delivery.

A direct mail template is a reusable design or layout used to create mailpieces efficiently.

The drop date is when a mailpiece enters the mailstream or is handed off to USPS.

Duplex printing prints on both sides of a sheet or mailpiece.

A dynamic template changes mailpiece content based on recipient data or campaign logic.

Electronic documentation submits commercial mailing information to USPS digitally.

Enhanced Line of Travel helps sequence addresses in approximate carrier delivery order.

An entry point is where mail enters the USPS network for processing and transportation.

An envelope teaser is copy printed on the outside of an envelope to encourage opens.

Every Door Direct Mail lets businesses mail to selected geographic areas without a named mailing list.

First-Class Mail is a USPS mail class often used for important or time-sensitive communications.

A flat is a larger, flexible mailpiece such as a catalog, booklet, or oversized envelope.

A folded self-mailer is a folded and sealed mailpiece sent without an envelope.

Full-Service Intelligent Mail uses unique barcodes and electronic documentation for greater mail visibility.

Geocoding converts mailing addresses into geographic coordinates.

A holdout group is intentionally excluded from a campaign to help measure incremental lift.

Householding groups people at the same address to reduce duplicate mail and improve targeting.

An HTML template uses code to generate personalized mailpieces at scale.

An indicia is a printed postage marking used instead of a stamp.

Informed Delivery gives participating USPS recipients a digital preview of incoming mail.

Informed Visibility uses mail scan data to provide visibility into mail movement through USPS.

The in-home date is the estimated date a mailpiece is expected to arrive.

An in-home window is the expected delivery date range for a mail campaign.

An insert is an additional printed piece included inside a mail package.

Intelligent direct mail uses data, automation, personalization, routing, and tracking to make mail more measurable.

The Intelligent Mail barcode helps USPS sort and track letters and flats.

Junk mail is a common term for unwanted or irrelevant mail, often used to describe poorly targeted campaigns.

LACSLink helps identify addresses changed by local conversions, renaming, or emergency address updates.

A landing page connects a direct mail campaign to a dedicated digital experience.

A letter is an envelope-based mailpiece commonly used for personal, transactional, or regulated communications.

A letter package includes an envelope, letter, and sometimes inserts or reply devices.

Lifecycle mail is triggered by a customer’s stage, behavior, or relationship with a brand.