I use a simple php script to send email with the mail() function.
This script is executed on myfirstdomain.com hosted on my DH account. I have a few more domain names hosted on this same account.
Here's my problem:
-If I use my script to send e-mail to firstname.lastname@example.org it works perfectly.
-If I use my script to send e-mail to email@example.com (which is the same domain name the script is executed from), I never get the e-mail (and it's not in my junk folder).