Checklist for good email delivery in php

I have a PHP application that sends email using the pear Mail function. Unfortunately all my emails end up in the junk folder.

Can i get a checklist for things i should do to make sure开发者_如何转开发 my emails are recieved correctly.

Thank you

---

MailChimp has several good articles on effective email marketing campaigns.

---

I wrote down a few points in an earlier question.