Keyline & page-sequence integrity check
Catch a skipped or duplicated page before a mailing ships.
What it checks
- Per-piece completeness — every page index from 1 to the piece total is present exactly once (a skipped or missing page is flagged)
- Duplicate and out-of-range page indexes within a mail piece
- Optional page-order continuity — off by default, so legitimately reordered presorted mail is not flagged
- Printed keyline against its 2D Data Matrix value, compared on normalized values where the 2D payload is available
FAQ
What is a keyline?
A keyline is a control string printed on every page (often mirrored in a 2D barcode) that identifies the mail piece and the page’s position within it — e.g. “08 01” for page 1 of an 8-page piece. Inserters and integrity systems use it to prove every piece is whole.
How do you catch a skipped page?
You declare which keyline segment is the total pages and which is the page index. Preflight groups pages into pieces and checks that every index 1..total is present exactly once, so a duplex/simplex mix-up that skips a number is flagged with the exact piece and the missing page.
Will presorted mail cause false alarms?
No. Completeness is checked within each piece regardless of piece order, and the cross-page order check is opt-in — so normal presort reordering never produces a finding unless you ask for strict order.
What happens to my documents?
Uploads are tenant-scoped, encrypted at rest, and anonymous uploads auto-purge within 24 hours. Result pages are token-gated and never indexed.