Well, sorry to confuse everyone, but thanks for the help...so - my trusty RaQ4 died today...I had email enabled on it ONLY so it sent out forms from PHP scripts I use.
I transfered all the domains and their files onto my Windows 2K server running Apache, and I changed all my DNS/domain records too. So now the webserver is on the same box as my mail server and domain server.
Everything seems OK viewing pages, but when I try to send a form through, Argo shows it coming in and then things hang with the message "354 Enter mail, end with "." on a line by itself". Sometimes I dont even get that.
I saw Roland's older post; maybe the issue is here in the PHP:
# Message Header Form Mail
$header = "From: <$from>\n";
$header .= "Return-path: <$from>\n";
$header .= "X-Sender-IP: " .$_SERVER['REMOTE_ADDR']."\n";
$header .= "X-Mailer: Gold Buying Girl Form Mailer \n";
$header .= "X-MailerWebSite: http://www.goldbuyinggirl.com/\n";
$header .= "Content-Type: text/html; \n charset=iso-8859-1 \n";
Perhaps Im brain dead after a brutal day...any ideas? Thanks