1234, Main Street
Boston, MA 02123
05 April, 2005
<Recipient Address Goes Here>
Please take notice that as of the date of this letter we have not received a satisfactory reply from you with regards to <issue>.
Be advised that if <required action> in <grace period> of the date of this letter, we will file a lawsuit against you to recover all damages and costs incurred, including attorney fees.
encl: <List of enclosed items goes here>