USPS Scan Trigger.
Email that lands the day mail does.
Every USPS mail piece carries an Intelligent Mail barcode. USPS scans the piece at every sortation facility on the way to the mailbox. The last scan — the one at the destination delivery unit (DDU) — happens hours before the letter carrier picks up the tray. DirectMail.io listens to that scan event in real time and fires a queued campaign email to the matching recipient at the moment it lands. Inbox and mailbox arrive on the same day, often within hours of each other. It’s a coordinated touch competitors using stitched email and mail vendors can’t replicate.
Five steps. Set up once. Runs per piece.
- 01
Queue the email before the drop
The email content is composed and locked in the platform 48 hours before the mail is expected to deliver. Variable data merges per recipient. Send is paused — waiting for the trigger.
- 02
Mail enters USPS sortation
Every piece carries an Intelligent Mail barcode (IMb). USPS scans each piece at every sortation hop — origin, NDC, SCF, and the destination delivery unit (DDU).
- 03
Informed Visibility streams scan events
USPS Informed Visibility exposes scan events in near-real-time over an API. DirectMail.io listens to that stream continuously across every active campaign.
- 04
Last scan fires the trigger
When a piece gets its DDU scan — the final scan before the carrier hands it off for delivery — the matching email releases to that exact recipient. The piece will be in their mailbox that day.
- 05
Email and mail co-land
The recipient walks to the mailbox and the inbox notification arrives within hours of each other. Open rates spike in the 2–4 hour window after the DDU scan. Co-landing measured.
Why same-day co-landing changes response.
Direct mail’s recipient psychology runs in 30-second windows. A piece that arrives in the mailbox is read or recycled within those 30 seconds. The scan-trigger email turns that 30-second decision into a 2-minute one — the recipient sees the email mention of the offer, walks to the mailbox, holds the physical piece while the email is still open in the other hand. That cognitive loop closes far more conversions than either channel does on its own.
Industry data shows the open rate on co-landed scan-trigger emails is materially higher than fixed-schedule post-drop sends — often double, depending on the offer. The compounding effect on response rate is even larger because the email is a second touch on a recipient already primed by the physical piece.
Where the scan trigger earns its keep.
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Acquisition campaigns
Net-new customer acquisition at multi-thousand-piece volumes. The scan trigger is what makes the mail piece feel like an event instead of a flyer.
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Retention / reactivation
"We miss you" mail pieces with co-landed email. Reactivation rates lift materially when the two channels coordinate.
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Promotional drops
Limited-time offers with co-landed email reinforce the deadline. Conversion windows close cleanly.
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Trigger-on-trigger
New-mover or birthday mail with co-landed email. The recipient gets a piece they didn't expect, plus an inbox confirmation that explains it.
Questions teams ask before deploying.
The short versions. For implementation-specific questions on your stack, book a demo.
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What is the USPS Scan Trigger?
The USPS Scan Trigger is a DirectMail.io feature that auto-fires a campaign email the moment a mail piece receives its last USPS sortation scan — the scan at the destination delivery unit (DDU). Because the DDU scan happens hours before the letter carrier delivers the piece, the recipient receives the email and the mail piece on the same day, often within a few hours of each other. It's built on USPS Informed Visibility, which exposes per-piece scan events over an API that DirectMail.io listens to continuously.
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How accurate is the USPS Scan Trigger?
A DDU scan results in same-day delivery roughly 85% of the time, with the remaining cases delivering on the next business day. DirectMail.io fires the email immediately on DDU scan, which means the email and mail piece co-land for the vast majority of recipients. For the small share of pieces that don't deliver same-day, the email still arrives within a tight window of the physical piece — usually within 24 hours.
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What if a mail piece does not produce a last scan?
Some small drops to DDUs that bypass full automation may not produce a final DDU scan. DirectMail.io includes fallback logic: if no scan event lands within a configurable window (typically 5–7 days), the email fires anyway as a standard post-drop send. No piece in your campaign gets dropped from the email sequence.
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How does this differ from a regular post-drop email?
A regular post-drop email sends on a fixed schedule — typically a day or two after the planned drop date, regardless of when each individual piece actually delivers. The USPS Scan Trigger sends per recipient, on the actual delivery day of that recipient's specific mail piece. Open rates spike 2–4 hours after a DDU scan because the recipient is physically going to the mailbox; that timing window is invisible to a fixed-schedule email send.
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What is required to run a USPS Scan Trigger campaign?
Three things: (1) the mail piece must carry a unique IMb (DirectMail.io applies one to every piece automatically), (2) the recipient list must include a usable email per record (DirectMail.io supports email-append on records that lack one), and (3) the campaign must be set up in DirectMail.io with both the mail and the email side configured. The Informed Visibility connection is built into the platform — there's no separate USPS API integration to configure.
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Can other platforms run USPS Scan Triggers?
A few can, but the requirement is strict: the platform needs Informed Visibility access, must own the IMb on the mail piece, and must run the email engine that fires on the scan event. Most direct mail vendors own one or two of those three components and integrate the rest, which introduces lag that breaks the co-landing effect. DirectMail.io owns all three under one platform, which is why the trigger fires within minutes of the actual scan.
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What email open rate should we expect?
Co-landed scan-trigger emails consistently outperform fixed-schedule post-drop emails on open rate by a wide margin. Typical performance lands in the 50–65% open range for the scan-trigger send vs. 25–35% for a same-audience fixed-schedule send. Click-through and conversion rates follow proportionally. The full campaign step-by-step is documented in the blog: How to Fire an Email the Moment USPS Scans Your Mail Piece.
Run a USPS Scan Trigger campaign on your list.
30-minute demo. We’ll show the trigger firing on a live mail run, with the email queue, the Informed Visibility stream, and the open-rate dashboard side by side.