Master the USPS SSA Window Exam 2025 – Slide into Success with Confidence!

Anonymous mail refers to mail that is not identifiable in terms of the sender, particularly when it is sent in a specific way that makes it difficult to trace back to an individual. The correct definition of anonymous mail includes the characteristics outlined in the first option: it bears postage stamps, weighs over 13 ounces, and is not presented directly to a retail clerk. This method of mailing allows the sender to remain untraceable, as presentation outside of a post office can anonymize the transaction.

The other options describe types of mail or conditions that do not align with the concept of anonymity. For instance, mail with an identifiable tracking system implies that the sender can be traced, contradicting the idea of anonymity. Likewise, mail delivered without any postage would not be considered valid under postal regulations and would normally be returned or rejected. Finally, mail that must be presented to a clerk for processing typically involves identification or tracking, negating the anonymous nature of the correspondence.