How do I prevent emails from going into SPAM folder?

Many e-mail service providers, including Gmail, AOL, Hotmail, Yahoo!, etc, have created spam filters to prevent unwanted messages from reaching your inbox. Unfortunately, these filters can also block e-mail messages you actually want to receive, such as those from To prevent emails from going into SPAM folder see below

To ensure continued receipt of our e-mails, you may want to add our e-mail address: to your address book and reconfigure your spam filter, if you use one.