Address appends.
Make a digital list mailable.
Most digital-first audiences are invisible to direct mail. Web-form leads, email subscribers, app users, identity-resolved visitors — they have email or phone or both, but rarely a mailing address. Address append closes the gap. The platform matches digital identifiers against postal identity graphs at household or individual precision, validates every appended address through standard NCOA and CASS pre-flight, and produces a mailable list. Audiences the team has been talking to digitally for years become mailable for the first time, and direct mail extends to recipients who never gave up an address through normal data collection.
Five steps. Per-match scoring. Pre-flight validated.
- 01
Submit the digital list — typically email or phone
Upload a list with email addresses, phone numbers, or names plus rough geography. Records that lack a mailing address are the address-append candidates; records that already have one route through standard postal hygiene instead.
- 02
Match against household and individual identity graphs
The platform matches each record against postal identity graphs at the household level (any person at this address) or individual level (this specific named person), depending on the campaign and the input data quality.
- 03
Match scoring per record
Every match returns a confidence score and a match level (household match, individual match, partial match). High-confidence matches flow into the campaign list; low-confidence matches surface in the report so the team chooses to include or exclude per campaign.
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Pre-mail validation runs on appended addresses
Every appended address runs through the standard postal pre-flight — NCOA, CASS, DPV — before the campaign queues. The append fills in the address; the validation confirms it's deliverable and the sortation will accept it.
- 05
Mailable list ready for the postal stack
Records that arrived as email-only or phone-only become mailable. The campaign can now run mail to recipients who never gave up a mailing address through normal data collection — closing the loop on digital-only audiences.
Why digital-first audiences are the cheapest direct mail audiences.
Acquiring a new mail recipient through standard channels — buying a list, running new-mover triggers, prospecting through co-op data — costs real per-record money. Activating a digital recipient who already opted into the brand costs the address-append match fee plus the standard mail production. The economics on appended audiences are typically materially better than on cold prospect lists, and the response rates are higher because the recipient already has a relationship with the brand.
The compounding lift is on attribution. A digital recipient who responds to direct mail typically responds in the digital channels the brand was already tracking — email, web visit, account login. The same identity resolves across both surfaces, and the team can see exactly how much incremental response came from the mail extension. The investment in append pays back per campaign on a measurable basis rather than against a "brand awareness" assumption.
And the structural advantage is that address-appended audiences fit cleanly into the rest of the omni-channel platform. Mail goes through NCOA-clean addresses with CASS-validated formatting; email continues to the existing email; SMS routes to the existing phone; Meta receives the hashed identity. The append unlocks the postal channel without breaking any of the digital channels the brand was already running.
Where address append earns its keep.
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Web-form lead activation
Lead lists captured through web forms typically have email and maybe phone — not a mailing address. Address append turns the digital lead into a mailable record, opening the campaign to direct mail follow-up the team couldn't run before.
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Email-list mailability extension
Brands with large email lists run address append to identify how much of the list is mailable. Often a meaningful percentage of long-standing email subscribers can be reached by mail — and the response on those subscribers materially exceeds email-only campaigns.
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App user reactivation
Mobile app brands with phone-number-only user records run address append to enable mail-based reactivation programs. Lapsed app users who don't respond to push notifications respond at much higher rates to physical mail.
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Identity-resolved web visitor activation
Visitors resolved through the Identity Resolution Pixel become mailable through address append automatically. The flow from anonymous visit to mailable record happens inside the platform without manual intervention.
Questions teams ask before deploying.
Short answers. For implementation specifics on household vs individual matching, B2B firmographic graphs, or recurring append cadence, book a demo.
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What is address append and how does it work?
Address append is the reverse of email append: the input is a digital identifier (email, phone, name plus location) and the output is a verified mailing address that ties to that identifier. The platform matches against postal identity graphs that resolve digital signals to household-level or individual-level postal addresses. The result is a list previously unmailable that becomes mailable — opening direct mail to email-only audiences, web-form leads, and any other digital-first data source.
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When would we use address append vs. just keeping the audience digital?
When direct mail is the high-leverage channel for the campaign and the audience is currently invisible to it. Most B2C audiences captured through web forms, email lists, or app signups have a meaningful share of records mailable via append — and direct mail to those recipients consistently outperforms the digital-only follow-up the brand was already running. The compounding response from coordinated mail plus digital is often the deciding factor on whether a marginal campaign produces ROI.
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What's the difference between household-level and individual-level address match?
Household match identifies any person at the address — useful when the campaign is addressed to "Resident" or to a household decision-maker. Individual match identifies the specific named person at their current address — required when the campaign needs to reach the recipient by name. Individual match is more demanding (name plus address graph alignment) and produces lower match rates than household match, but the precision is necessary for personalized variable-data campaigns.
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Are appended addresses run through NCOA and CASS like other lists?
Yes. Every appended address flows into the standard postal pre-flight pass — NCOA, CASS, DPV — before any campaign uses it. The append fills in the address; the validation confirms the address is deliverable and standardized to USPS Pub 28. An appended address that fails DPV or fails NCOA forwarding logic gets the same treatment as any other failed validation, surfaced in the report rather than silently mailed.
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Does address append work for B2B records?
B2B address append matches corporate email or phone records to business addresses where the firmographic data supports the resolution. Match rates depend on the breadth of the firmographic graph and the recency of the corporate data. For B2B campaigns specifically targeting named executives or decision-makers at specific companies, the platform supports targeted firmographic append separate from the consumer flow.
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How is address append different from buying a list from a data provider?
Buying a list adds new records to the audience. Address append adds postal addresses to records the team already has. The team that already captured the recipient through web form, email signup, or app registration owns the relationship; address append makes that relationship mailable. Buying a list creates a cold prospect file; address append activates a warm audience the team has been talking to digitally already.
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How is address append billed?
Per verified match returned, in most use cases. Records that fail to produce a usable mailing address are not billed. The platform reports the match count and the per-record confidence scores before any charges commit, so the team always sees the math before the spend. Plan tiers and volume detail live on the pricing page.
Run address append on a digital list.
Bring 1,000 records with email or phone but no mailing address. We’ll show the match rate, per-record confidence scoring, NCOA/CASS validation, and the mailable output — in 30 minutes.