This is a short note that is sent after the proposal or quotation is sent. It's a courtesy letter, which reinforces your interest in the business and reminds them of who you are.
1234, Main Street
Boston, MA 02123
08 April, 2005
<Recipient Address Goes Here>
I just wanted to drop you a short note to tell you how pleased we were to be able to <what you did>. As we mentioned in the <proposal/quotation/bid>, <highlights.>
I will follow up with you <when> to see is you have made a decision. Thank you for your consideration.
encl: <List of enclosed items goes here>