I'm selling my house with a closing date of January 9th. I received my mortgage payoff letter from Pennymac that is good through January 12th.I am writing to provide you instructions on how to apply payments when I send an amount greater than the minimum amount due. Direct Deposit Program. Want to mail a payment? Access the Middlesex Savings Bank mailing address for bill payment or contact one of our MA branches today. A payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work.