Can you track 1st class mail once it has been sent?

The ability to track First-Class Mail depends on the service level selected when sending the mail. Generally, First-Class Mail does not come with tracking as a standard feature for letters. However, options like First-Class Package Service and certified mail do provide tracking capabilities.

In this context, the correct answer is based on recognizing that while standard First-Class Mail letters are not trackable, there are specific situations—like if the sender chooses additional services—where tracking becomes available. First-Class Package Service, for example, includes tracking as a standard feature for parcels, while certified mail offers tracking along with proof of delivery. Therefore, saying that tracking is universally available for all types of First-Class Mail misrepresents the service's capabilities, particularly regarding standard letters.