Yes - it's called a router, or sometimes a firewall. You put ACLs on one or both of them for port 25, allowing only the Exchange server to talk on that port, and denying all others.
Kurt On Tue, Aug 19, 2008 at 6:00 AM, JP <[EMAIL PROTECTED]> wrote: > We are being affected by viruses on workstations that send mail thru an SMTP > generated by the virus, bypassing our exchange server. As a result, we get > blacklisted before we know it. I can remove the entire server where exchange > is from the network and mail is still flowing out. My question is this: is > there a method of blocking E-Mail sent thru port 25 by anyone but exchange? > How can we stop these situations? > > Thank you in advance for your assistance. > > J.P. Lacasse > ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ > ~ http://www.sunbeltsoftware.com/Ninja ~ > ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
