Which mail service requires completion of PS Form 3813 or 3813-P?

The requirement to complete PS Form 3813 or 3813-P is specifically associated with Insured Mail. This form is used to document the amount of insurance requested for a piece of mail, allowing postal employees to process and verify insurance coverage effectively. By completing this form, customers can ensure their item is protected against loss or damage, which is a primary feature of Insured Mail.

In this context, the other mail services mentioned do not require these specific forms for their processes. Priority Mail, for instance, offers a faster service but does not inherently include insurance without separate purchase or documentation. Express Mail offers guaranteed delivery times and automatically includes insurance, but uses a different form of documentation for this purpose. Standard Mail, primarily for marketing and bulk mailing, does not typically involve insurance coverage, hence it does not require the filing of either PS Form 3813 or 3813-P. This distinct requirement for Insured Mail helps facilitate the handling and accountability of valuable items sent through the postal system.