Sendmail and php mail() issues

[totoro001]

Alright, I'm trying to use php's mail() function to send mail (which in *nix -- in my case FreeBSD -- it uses sendmail) and I get the same error over and over when executing my php script via the command line: 
[quote]
"Recipient names must be specified"
[/quote]
and when i check the /var/log/maillog i get:
[quote]
"Jan 18 03:35:26 web1 sendmail[4436]: l0IBZQit004436: from=totoro001, size=730, class=0, nrcpts=0, sgid=<[email protected]>, relay=totoro001@localhost"
[/quote]
i thought it might be an issue with my php.ini file, but there's really not much for configuration when you're using sendmail:
[quote]
sendmail_path = /usr/sbin/sendmail
[/quote]
now for code, i'm just using the standard:
[quote]
mail('[email protected]', 'subject', 'message');
OR
mail('[email protected]', 'subject', 'message', null, '[email protected]');
[/quote]
i get the same recipient error each time.  i CAN however send mail from the command line using:
[quote]
echo "test body" | mail -s "test subject" [email protected]
[/quote]
so i know that sendmail is working (and the address i'm sending it to is NOT on the local machine).  any ideas?  any info you want from me that might help solve it?

[fiat]

Set some content headers

such as

$headers  = "MIME-Version: 1.0\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\n";


then mail in the format

mail($to, $subject, $message, $headers);

[totoro001]

nope sorry, same error after adding the headers.

[totoro001]

so nobody's ever seen this error before? it's gotta be something with either the php.ini, or how php interacts with sendmail.