LetterTrack was developed to provide online retailers and online marketplace sellers(like those selling products on eBay, Etsy, and Amazon) with the ability to track lightweight, inexpensive items. As long as the mailpiece weighs 3.5oz or less and can be mailed in an envelope or bubble mailer, it can be mailed and tracked through LetterTrack. Our proprietary software allows you to print on envelopes of various formats or address labels in various sizes and adds a USPS intelligent mail barcode above the address block of the recipient of your mailpiece. As your mail travels through the postal system to its destination, the intelligent mail barcodes on your mailpieces are scanned at each facility. LetterTrack captures these scans to provide the seller and buyer with real time tracking emails each time a mailpiece is scanned. When a mailpiece reaches the destination post office to be placed on a USPS postal truck for delivery, the mailpiece is marked as Out for Delivery. Since the USPS has now geo-fenced most of the mailboxes in the US and has also equipped their mail carriers with geo-enabled devices, the final tracking event for most envelopes will be Delivered in Mailbox. This tracking event indicates the exact date/time that a postal truck containing an envelope with an Informed Visibility barcode for a specific address has traveled past the mailbox for that address. Your mail will reach the recipient in 3 to 5 business days since it is being sent via First Class mail.