Query Letter - Professional Look
Your query letter should have a professional look.

§ There should be no spelling or grammar errors.
§ Be sure to include the date on your letter. This can be important if you feel later on that your idea has been stolen.
§ It should be addressed to the appropriate editor. Use their full name and do not use Mr. Mrs. or otherwise. The exception to this rule is Dr. or other professional title.
§ The publication name and address should be correct.
§ The salutation should be formal.
§ If mailed, the paper and the letterhead should be clean and professional. Standard 8 1/2 x 11 inch paper should be used.
§ Single-space your paragraphs and double-space between paragraphs.
§ If mailed, the Query should include Self Addressed Stamped Envelope (SASE)
so that the editor can return your article or reply to you conveniently.
§ Include your name, postal address, email address and phone number in the letterhead or at the bottom of the letter.

These are just a few helpful comments. Use them - they will make the difference between being read and having your query thrown in the round-file. Good luck!