Short responses from readers. Longer essays from syndicated columnists, newspapers staff members, or the public. When talking to editors, use the terms in these ways to avoid confusion. The letters section is one of the best-read parts of a paper. Send submissions to specific addresses and people responsible for handling them.
Most papers allow mail, fax, or email submissions.
Follow the instructions carefully so that your letter doesn't end up on the wrong desk. Avoid flowery language, write in clear and concise fashion, keep paragraphs to no more than two or three sentences. Don't assume that editors will censor critical or radical commentary. It happens often enough, but editors also like controversy. Avoid phrases that will be seen as left-wing cliches.