Yes You Can use compatible “green” toner cartridges in your printer and maintain your warranty!
From Bold Spicy News:
One of my clients recently received a call from a Pitney Bowes Sales Rep. They were calling to see if my client needed additional red inkjet cartridges for their Pitney Bowes mailmachine. My client informed the Pitney Bowes rep that they had purchased their ink from Print Green USA, Inc., and at substantial savings. The Pitney Bowes rep then stated that using cartridges that weren’t Pitney Bowes brand would void the warranty on the mailmachine. That is not the case at all. In fact it is illegal for a manufacturer to require that a consumer use a certain brand of product as a condition of the warranty. This is covered by the Magnusson Moss Warranty Act. Read More Here