PHP Mail will not process ".com"

I know this is weird, but when a ".com" is added to the subject or body text to send PHP mail (like - xyz.com), the mail will not send. It's a problem with this hosting company (ipage) but i want to see if their is something i can do in the script itself, because it's a CMS of mines and i would like to keep generalized for everyone who uses it.

script is simple and as follows:

function confirmEmail($username, $email, $confirm_code) {

   $sitename = str_replace(".com", " .com", site_name);
   $subject  = "Your confirmation link here";
   $headers .= 'To: '.$username.' <'.$email.'>' . "\r\n";
   $headers .= "From: ".$sitename." <".support_email.">". "\r\n";
   $message  = "Your Comfirmation link \n
   Click on this link to activate your 开发者_开发技巧account \n
   ".root."/confirm.php?confirm=$confirm_code";

   $message = wordwrap($message, 70);

   $sendmail = mail($username,$subject,$message,$headers);
   if ( $sendmail ) {
    return true;  
   } else {
    return false;
   }

  }

Now as you can see, i replace the ".com" with " .com"(note the space at the beginning) for the $sitename variable, and that works but the problem is the "root" contains the full path to the givin site so the link is like "xyz.com/confirm.php?confirm=$confirm_code". I can't allow a space before the '.com' in the site path like "xyz .com/etc..." because the obviously the user can't click the link from within their email.

I know this is a weird problem and I have no clue on what's going on or what to even ask the hosting to change.

*note: site_name and root are defined previously in another page, and they work fine. Also no errors are being returned.

Any ideas out there?

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Your code is correct. Your workaround should not be necessary.

This is very likely a provider issue.

Don't know about your environment, but if you have not full control of your mailserver, try sending a mail with a link using telnet so you really see everything. Often spam filters etc are badly configured and don't return the correct codes.

If you don't have any luck with that I recommend switching to an external SMTP server that is well configured. You can perfectly use gmail for that if you dont send tons of mails.