Make sure you sign your name and include your address and phone number. This will help you clarify what your most important points are. Avoid rambling and giving too much unnecessary information. It's always best to stick to your 1 to 3 messages. Remember there is a lot of competition to get published.
Shorter pieces are more likely to be printed, and, more importantly, likely to be read.
When responding to another letter, many writers feel they must address each point. You can find the paper's address on the LTE page. Some invite faxes and e-mails, too. The privacy policy covers exchanges of personally identifiable information with pprm.org web site. Any personally identifiable information will be held confidential by Planned Parenthood of the Rocky Mountains.