I know this problem has already been beaten to death, but I can't find the answer to this specific problem so any help or insight is appreciated!
I built a form that uses PHP's mail() function to deliver the data to an email address. Here's the problem: when I direct the form to send data to my personal Gmail account, it arrives perfectly. When I change the sendto address to an email account with another hosting company it doesn't ever arrive. Both the website and email addresses share the same domain name, but are set up through different companies because of timing issues.
I've contacted both companies and both seem to have done everything they can to fix the problem, but the emails still won't arrive. I'm out of ideas, and since I'm kind of new at this, I don't even really know what the life of an email is, much less how to troubleshoot it. All I know is that my form works, because I've received emails on my personal account from it.
If anyone has ideas, solutions or just speculations that I should inquire futher about, I appreciate it.