Tech Guides
03/20/2024
Informed Delivery Mail.XML Mailer Guide

This is a guide for submitting campaigns to PostalOne! via Mail.XML electronic documentation (eDoc).

Tech Guides
03/20/2024
Informed Delivery Mail.dat Mailer Guide

This is a mailer guide for creating campaigns via PostalOne! through Mail.dat eDoc submission.

Tech Guides
03/19/2024
MASS™ Technical Guide for Cycle O

This document provides a technical guide for MASS™ Cycle O. MASS™ is an extension of the CASS™ system.

Tech Guides
03/19/2024
CASS™ Technical Guide for Cycle O

This document provides a technical guide for the CASS™ product. The CASS certification process is designed in cooperation with the mailing industry to improve the accuracy and deliverability of addresses for mail qualifying for postal discounts.

Contact Lists
03/19/2024
MPE (Mail Processing Equipment) Service Provider Licensees

Marketing contact information for certified Mail Processing Equipment (MPE) licensees 

Contact Lists
03/19/2024
LACSLink® Developers (PDF)

This document contains a contact list of LACSLink® developers.

Contact Lists
03/19/2024
LACSLink® Distributors (PDF)

This document contains the contact list of LACSLink® distributors. 

Tech Guides
03/18/2024
Known Issues List 3-18-2024
Announcements
03/16/2024
Southern Area – AL-MS District Luverne Post Office 36049 – Temporarily Suspended
Announcements
03/15/2024
DELIVERY: Central Area - Ohio 1 District - Mount Hope Post Office (44660) - Operations Suspended