While Snopes.com does not have any articles about Publishers Clearing House, I did find this
"Many people wonder whether Publishers Clearing House sweepstakes are legitimate. They are. The giveaways are closely watched by state regulatory commissions and legal agencies.
The company is so famous and its sweepstakes so popular that the chances to win are extremely low. Furthermore, the entry process includes several pages of advertisements and offers. You can receive a high volume of mail if you overlook the opt-out options, so take the time to read through what you are agreeing to when entering.
Remember, even if PCH odds are as high as the lottery, some of their prizes are as big or bigger - and free to enter.
Publisher's Clearinghouse Sweepstakes Scam Warning:
Although Publishers Clearing House sweepstakes are legitimate, a number of scammers try to capitalize on the popularity of these sweepstakes by using the PCH name to lure in victims. For this reason, Publishers Clearing House has its own Consumer Alerts Section
to warn people of scams that use its name. If you have received a win notice that claims to be from PCH, contact them directly
to discover whether it is legitimate or not.
I Have More Questions about Publishers Clearing House:
Many of the most commonly asked questions about PCH sweepstakes are answered in my Publishers Clearing House FAQ