Depending on the mailing class you use, the USPS may or may not offer tracking services. For example, First-Class Mail, a cost-effective service that allows you to mail a postcard or letter, typically takes about one to three business days to deliver. However, some cards may take up to seven days.
The USPS also offers a service called Informed Delivery, which allows you to check the status of your incoming mail. You can opt-in to receive daily emails from the USPS about your incoming mail.
First-Class Mail is the most cost-effective service offered by the USPS. This service is used to mail letters, postcards, and flats. This service also offers tracking. The size of your postcard or letter must meet USPS size specifications. The postcard or letter must be at least 6.125" by 11.5", and the thickness must range from 3.5 oz to 4.5 oz.
Registered Mail is a service offered by the USPS that allows you to track your domestic first-class mail. This service includes detailed records of your envelopes and parcels. You will be able to find out where your parcel has been delivered, including the delivery date, time, and location.
Certified Mail is another service offered by the USPS. This service provides you with a tracking number and a copy of your signature. You can also check the status of your certified mail online. Certified mail can only be shipped within the United States. If you are mailing certified mail, the recipient must sign for their mail.