Hello all,

My web server set up:
Win 2k with default smtp server enabled. 60 websites hosted

My problem:
SPAMMERS! i get around 200 emails everyday

I figured out:
if i do telnet <server:ip> 25, i get access.
i type ehlo anydomain.com, get response : 250 OK
i type mail from:youremail@anydomain.com, get response :
youremail@anydomain.com.... Sender OK
then i type rcpt to:user@spam.com(where spam.com is not hosted on my
server), i get response : Unable to relay. (Authentication problem i
guess)

[everything fine and i am happy that my server is not relaying spam
and not bombing the domains not hosted on my web server]

now if i type rcpt to:user@mydomain.com(where mydomain.com is hosted
on my server), i get access and can send unlimited emails to users for
any domain hosted on my website. most of the websites on our domain
has got catch all. the main target of the spam is my own domain name
coz when spam program gets access to port 25 of my web server, the
first welcome message revails my own domain name with ns1 at the
front.

Can any one help me how can i set authentication for any mail to be
delivered to any local recipient?

ITS AN EMERGENCY !

Warm regards

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