<P> In postal mail, a return address is an explicit inclusion of the address of the person sending the message . It provides the recipient (and sometimes authorized intermediaries) with a means to determine how to respond to the sender of the message if needed . The return address need not include a sender's name, but should include address or P.O. box details in the same way as the delivery address should . In some countries, the return address is conventionally located in the upper left hand corner of the envelope, card, or label . In the United Kingdom, the return address is usually placed on the reverse of the envelope, near the top . </P> <P> Businesses often use envelopes preprinted with a return address . Many individuals have sheets of adhesive labels preprinted with their home address to affix to their correspondence . Charities sometimes include such sheets in mailshots . Rolls of Return Address Labels can be purchased from companies that sell personalized labels to provide individuals an easy way to peel and stick return address labels to their envelopes . </P>

Do you have to put a sender address on mail