Which of the following is NOT a characteristic of anonymous mail?

The choice indicating that the mail is presented to the retail counter employee is not a characteristic of anonymous mail. Anonymous mail is typically identified by its lack of identifiable information about the sender, including the absence of a return address.

When mail is considered anonymous, it often comes with certain specificities. Mail that weighs over 13 ounces generally needs to be presented at the retail counter for postage and verification, but this aspect does not directly correlate with whether the mail can be categorized as anonymous. The fundamental characteristics of anonymous mail focus more on how the sender presents themselves (or lacks a presence) in terms of identification, such as not including return addresses or identifiable information on the mailing itself, rather than the process by which it is presented to postal employees.

This understanding highlights the distinction between general mail-handling procedures and the defining features that characterize anonymous correspondence.