Tracking mail() problems

Hi all, I am running PHP 4.03 on a linux box and am having problems with the mail() function. I use the syntax: ("ckirby@domainA.com.au", "if this works, ring me and we party", "Line 1\nLine 2\nLine 3", "From: bradwright@optushome.com.au") When the script is run, i get no error msg, and the rest of the script works fine, but no mail sent. Mail log shows no record of any event from this script. Is there another way that I can check foir activity from this function/?. Any ideas, this is killing me. Thanks in advance, brad