Hello. I have written a php program using the mail() function. However when it is received it is marked in the header with "may be forged." I have no problems getting the email with one of my own email accounts not on the same server. But the real intended recipient is tossing it out as spam, although I can't be sure about that. I just know they say they aren't getting it. (It's not one of the web email providers like yahoo, etc.)
Partial header is:
"Received: from design432.com (188.8.131.52.west-datacenter.net [184.108.40.206] (may be forged))
by bbcmidessa.com (8.13.1/8.13.1) with ESMTP id m9T1ec9v005810
for <email@example.com>; Tue, 28 Oct 2008 19:40:38 -0600"
Why does my email header get marked with the "may be forged" message? And how can I avoid that?