Where do mailing notations go in a letter?

Mailing notations go in the upper left corner of the envelope, above the return address.

Here are some examples of mailing notations:

* "Certified Mail"

* "Return Receipt Requested"

* "Registered Mail"

* "Priority Mail"

* "Express Mail"

* "First-Class Mail"

* "Do Not Bend"

* "Handle With Care"

* "Fragile"

Important Note: These notations should be written clearly and concisely, and the USPS offers specific instructions on how to write them correctly.