Mail not arriving to email with same domain as sendmail_from

[dotty]

Hi,

I have a form that sends mail which works find when I test on my own email or any email other than the email it's supposed to go to - i.e. the email that's associated with the domain that's sending the mail.

Here's what I'm using:

$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$recipient = '[e-mail]' . "\r\n";

ini_set("smtp_port", "25"); 
ini_set("sendmail_from", "[e-mail]");

mail($recipient, ' Enquiry', $message, $headers);

The IT guy says it could be refusing the incoming mail, because it appears to come from itself - does anyone know how to resolve this. I suspect there needs to be some ini setting changed but I don't know what. It's on a Windows server.

Any help is appreciated!

[Ashley_Sheridan]

I've seen this happen on Zen hosting before, and it turned out it was down to their internal mail servers causing problems. Speak to the tech support for your hosting, and explain the problem. If they try to fob you off with "it must be your code" answer, explain to them that it does work for other email addresses.