I have been using Project Pier for a short while now and have been very happy so far. But as of about a week ago all messages are returned as spam. My webhost is a reseller of www.hostrocket.com. Linux, Apache, PHP, cPanel, SpamAssassin, etc. We have tried various things. Changed settings to SpamAssassin, tried using other email accounts for the mail settings in Project Pier including a gmail account. Nothing made a difference. Project Pier mail setting is on PHP settings. I'm not very experienced at hosting. What settings do I need to look at changing and what should it be? I don't believe the problem is with Project Pier, it's probably with my webhost or my settings in cPanel but I don't know what things should be set to. Any help will be appreciated.
There are a lot of blacklists maintained by various anti-spam organizations and companies. Your server may have been blacklisted. There are several web sites that allow you to determine if your server is blacklisted. One such tool is: http://www.mxtoolbox.com/blacklists.aspx
The email header should show you the IP address from which the email is being sent (probably your server's ip address if your using PHP for sending mail). This is the IP address you want to find out whether it has been black listed. If it has been black listed then you need to contact the list owner and request to be removed from the list. Otherwise you'll need to find another way to send mail, a properly configured SMTP server is essential to staying off the blacklists. You can also run tests on line to see whether your server is acting as an open relay, if it is then that will explain the reason for being blacklisted. Just google "open relay check", one such example is http://www.checkor.com/
-Jon