Point out a problem that the prospect has. This is the adverting classic. Watch for it in marketing and commercials everywhere. Direct the reader's attention to a problem, then make the problem seem worse. Once you've established the problem as a major impediment in the reader's life, introduce your service or product as the solution.
Most sales letters begin with a headline that quickly presents the major points.
Dear Computer Enthusiast, And that brings us to another point. When you're sending out lots of sales letters, a salutation to the general jobs or interests of your readers works just as well as typing in each reader's name. Include a P.S. at the end of your letter. The P.S. should briefly restate the main points of your offer. Finally, stress benefits rather than features.