1234, Main Street
Boston, MA 02123
06 April, 2005
<Recipient Address Goes Here>
Re: <insert case name>
This will confirm that you have agreed to act as my attorney in the above-referenced matter. Pursuant to our retainer agreement, you will bill me for your time at a rate of <hourly or flat fee rate>, to be billed on a <billing interval> basis. In return, you will represent my interests in this lawsuit and work to bring about a speedy and positive conclusion of the case.
I will, of course, direct any further inquiries or correspondence I receive regarding this matter to your office. Thank you for your assistance and professional handling of this case. I would appreciate receiving periodic reports of your progress in settling this matter. I look forward to hearing from you.
encl: <List of enclosed items goes here>