spam mail from my server !!?

my ISP called me asking about lots of spam emails comming out from my server.
it seems it's a virus , i'm not sure,

i'm using MS Exchange server 5.5

any one have any idea what to do ?

If you have SMTP relaying turned on, turn it off.

DjM

Do you have a <FORM> command on your webpage?

Two things to do...turn off SMTP relaying (if you can). Run a virus scanner on the email server to see if you have been "infected."

HTH

http://www.abuse.net/relay.html run your server through that that will let you know if its on or not
RiOtEr

ok guys ... i can't turn off the SMTP coz' the mail goes through it ...
the server act as in-comming and out-going mail server ... and it's just a mail server not web based mail system.

so how can i deny SMTP mail relaying from outside my LAN.
and by the way ... anti virus didn't help .

Bimmer, You should get a firewall. Have it filter all out going data packets port 25(SMTP).
Specify that you only want outbound traffic on your smtp coming from your lan.

isn't there any other solution than the firewall .

I asked a few co-workers about this and they could offer any other FOR SURE solution. The Best way would be a software firewall. Configure it filter 25,and set the rule. Other than that theorectically, I think you could download a Administration tool from any Networking site. I'm sure somone has made a program doing what you need.

I am interested in how your being exploited. Do you have a website? If that has a mail server on it. And you use your mail server to submit <FORM> in HTML you could be exploited in more ways than one.

Are you using "Send Mail" as you SMTP Engine? If not, what are you using?


DjM