Always address your submissions to the correct editor. Contact the publication, read through the staff box or speak to other writers and contributors to a magazine. Find out who should receive submissions and then spell that person's name correctly. This will let the editor know that you care enough about your writing to send it to the correct person. When sending a poem through e-mail, make sure you copy it directly into the message area.
Editors use different computers and programs.
Mailing them an attached file is a waste of time, and could make them suspicious of receiving a virus. Keep your e-mail simple. If your writing can't speak for itself, all the packaging in the world won't help. Make sure to send a copy of the e-mail to yourself. This will verify that the e-mail went through correctly and give you a dated copy of your submission.