Spam mail.php!

Hello,

i have a problem o spam on 4 servers today, i have note that the spam start from files mail.php of Oscommerce and other script like Newsletter but all with the name mail.php here's a example

From: by@myhostname.net
Content-Type: text/plain; charset=\"us-ascii\"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Company Poised to triple
Message-Id: <E1EgORB-0001JJ-KM@myhostname.net>
Date: Sun, 27 Nov 2005 16:27:33 +0100

hello world!
f45190487553cc89a00290c7c44c7154
.
<by
Content-Type: text/plain; charset=\"us-ascii\"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Company Poised to triple
bcc: godsproperty70@aol.com, jwhland@aol.com, juandiablito21@aol.com,
bspoiled9@aol.com, asw3230@aol.com, arniebernstein@aol.com,
cyberdjv.im@verizon.net, jackieunr@in-tch.com,
........

now i have all these servers in black list, how can i stop this problem?
the only way is to delete mail.php files?
how he send spam from this files?

thank you

 

 

 

 

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