Starting April 14th you will be able to sign up for a free service of the U.S. Postal Service that will send you an email each morning with images of the mail you will be receiving later that day. This service had been done on a pilot basis since 2014 in parts of California, Connecticut, Maryland, Virginia and Washington D.C..
Identity theft through the stealing of mail such as credit card statements and bank statements from your mailbox is a significant problem and this new program will both alert you as to when to look for important mail, as well as let you know if such important mail has been stolen from your mailbox so you can respond more quickly.
Unless you live in one of the areas involved in the pilot program, you cannot sign up for the program until April 14th. Here is the link to go to sign up. https://informeddelivery.usps.com/box/pages/intro/start.action
It is important to note that if you do sign up for the service, you should use a unique and complex password to prevent identity thieves from hacking your account to let them know when important mail that they can exploit for identity theft purposes will be arriving to your home.