Does IRIS guarantee a delivery date?
No. IRIS shows estimates and available scan events, but USPS controls transportation and final delivery.
Delivery times
IRIS prepares paid letters for its print partner and USPS handoff. USPS publishes a 1–5 business-day service standard for First-Class Mail after mailing.
What this page helps you do
Separate IRIS production time from the USPS delivery estimate and understand when scans may appear.
1–5 business days
USPS's published First-Class Mail delivery standard after the letter enters the mailstream.
1 business day target
IRIS's normal target to print, envelope, and hand off a paid letter; not a guarantee.
Scan timing varies
Certified Mail has tracking, but USPS does not scan every piece at every processing point.
Certified Mail uses an eligible First-Class Mail letter and adds mailing and delivery records. Timelines are estimates, and weather, address issues, holidays, and USPS operations can delay a piece. IRIS is an independent service and is not affiliated with or endorsed by USPS.
Read the USPS First-Class Mail service standard and see how Certified Mail works through IRIS.
Delivery questions
When will tracking appear?
Certified Mail receives a tracking number. Scan timing depends on the print handoff and USPS processing, and not every piece receives a scan at every stop.
Does Certified Mail travel faster?
No faster service is promised. Certified Mail adds a mailing record and delivery information to an eligible First-Class Mail letter.