Do you send a lot of letters? Turn your undelivered mail into a bad storage space by adding the sender's address. It's simple! If the post office can't find the delivery address, look on the back of the envelope and know where to return the mail. These mini inkjet labels can be personalised with your own address and logo. It's very easy to create them using Avery's free formats and software. You don't have to go through a printer if you can create it yourself so quickly