Having had the pleasure of mailing you [name of magazine] every month for the past three years， we were wondering if perhaps you haven't realized that your subscription¹ ran out in    [month]

　　We mailed you our     [month]     issue and have not yet removed your name from our subscriber's list inasmuch as we felt that you may be unaware² that it is time for your renewal³.

　　We have enclosed our renewal subscription card for you which provides for 12 issues of     [name of magazine] at the low price of $      per issue， or $       less than the newsstand price.  As you can see， this represents a substantial savings⁴.

　　We are looking forward to hearing from you soon