Mailing regulations are rules set by postal services that govern how items can be sent through the mail. These regulations cover various aspects, including acceptable package sizes, weight limits, and prohibited items. For example, items like hazardous materials or perishable goods may have specific restrictions to ensure safety and efficiency in the mailing process. Additionally, mailing regulations often include guidelines for addressing packages correctly. This ensures that mail is delivered accurately and promptly. Proper labeling, including the use of postal codes and return addresses, is essential for smooth delivery. Understanding these regulations helps both senders and recipients navigate the mailing system effectively.