This letter informs a company about a problem with one of its products.
1234, Main Street
Boston, MA 02123
31 March, 2005
<Recipient Address Goes Here>
<time you purchased product> I purchased <product name>. After using it several times, I have noticed a <description> problem with it that you should know about.
I don't know if you have received this information from other customers, but I think this matter is worth looking into. Please contact me regarding my <product name>, and I will be happy to give you any further information. Thank you.
encl: <List of enclosed items goes here>