> For the complete documentation index, see [llms.txt](https://help.openletterconnect.com/olc-help-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.openletterconnect.com/olc-help-docs/delivery-status-and-tracking-analytics/tracking-analytics-overview.md).

# Tracking Analytics Overview

#### Data Accuracy and Update Frequency

* Tracking data is updated in **real time** as USPS scan events are received and processed.
* Occasionally, delays may occur if USPS scans are batched or if there are postal service disruptions.
* Delivery statuses marked as "Delivered" indicate the mailpiece was scanned by USPS as out for delivery, which may be before the recipient physically receives the mail (see detailed explanation below).

#### Important Notes on Delivery Status Interpretation

* USPS scanning usually occurs when mail is loaded on the delivery truck. Many carriers do not scan at the exact moment of physical delivery, so there may be a **delay of a few days** between the system showing "Delivered" and the mailpiece arriving with the recipient.
* The status "Delivered" should be understood as "Out for delivery" or "Delivery scan received," not necessarily confirmed receipt.
* Missing scans or "Not Scanned" status can happen and do not always mean lost mail. USPS scanning is not perfect and some mailpieces may not be scanned at every step.
* Returned mail indicates a delivery failure due to address issues or recipient refusal.

#### Using Delivery Tracking Analytics

* Use these metrics to **assess the reliability of your mailing list and lead sources**. High delivery and scan rates indicate better data quality.
* Tracking helps identify issues such as high return rates or undeliverable addresses to clean your lists and improve campaign ROI.
* Refer to the **Delivery Status Explanation** above to communicate realistic expectations to your clients regarding timing and scan interpretations.

#### QR Code Tracking and Lead Quality

* Every mailpiece includes a **unique QR code personalized for each contact**.
* QR scan data is collected and integrated into your dashboard analytics.
* This tracking allows you to see which recipients engaged with the mailer, providing insight into **lead responsiveness and quality**.
* Combine physical delivery data with QR engagement to optimize targeting and messaging strategies.