What does the acronym IMM stand for in the context of international mail?

The acronym IMM stands for International Mail Manual. This manual serves as a comprehensive guide detailing the rules, procedures, and policies that govern the handling and processing of international mail through the United States Postal Service (USPS). It is designed to assist postal employees and customers by providing essential information regarding international shipping options, customs requirements, mailing restrictions, and service standards. Understanding the content of the IMM is crucial for effectively navigating the complexities associated with international mail services, ensuring compliance with regulations, and facilitating smooth transactions for mail destined for other countries.