I have received an e-mail from BT (my ISP)saying "It has come to my attention through routine security checks that your BT Internet account can be used as an Open Email Relay." I was totally baffled about how this could be so searched the web and found advice where it says you can if your PC is acting as a mailserver by running (from a command prompt): telnet localhost 25
I did this and to my surprise/horror it comes back: "220 Microsoft ESMTP Mail Service, Version 6.0.2600.1106 ready at Wed 22 Oct 2003...." I take it this confirms I do indeed have a mailserver running, but I cant see how to gain access to stop it running, or disable it.
I am running Windows XP Professional, and (in case there's simpler fix via my firewall) am also running Norton Internet Security as my Firewall. Is the mailserver part of IIS? If so, I do need IIS to be active purely for local testing of websites we design, but I do not need to have the local mailserver running on my PC.
Can someone please tell me how I can stop, or completely disable, this mailserver, whilst ensuring IIS still works OK?
Thanks for the advice Jester. I have Norton Antivirus and Norton Firewall permanently on and up-to-date and I've also run scans to check but my PCs are clean. I'd really just like to know how I can disable the PCs' mailserver as that will give me confidence that it cant be abused in this way.
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