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Spam problems

 
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lgreusard



Joined: 18 Jun 2012
Posts: 1

PostPosted: Mon 18 Jun '12 8:08    Post subject: Spam problems Reply with quote

Hello,

We have a lot of spam problemes here with sambar server.
Server OS is win 2000 Terminal.

Some people seems to use our server as an open relay. By listening network cars with wireshark, i see some mail spams incoming, then relayed to our internet smtp (so its relayed).

A big part of email target (final targets of spam) are *@*.com.br

When i use a telnet our public IP from internet, it seems smtp auth is needed (so not an open relay ?). but in wireshark i see that the account use for authenticating and relaying spam through our server is arandomhash@myserveurdomain.net

i can't give my ip adress here for tests, sorry.

In sambar config, i see SMTP auth OFF, but telnet says "need login"...

Sorry for my not-perfect english.

Thx in advance for answers. Confused
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Johannes
Moderator


Joined: 27 Nov 2005
Posts: 145
Location: SK,Canada

PostPosted: Wed 20 Jun '12 3:10    Post subject: Reply with quote

Hi,

you need to set the following in mail.ini

Require AUTH = true
Restrict Relay = true

The minimum is
Require AUTH = true

and your open relay is gone.

Now that this is set to "true", your users have to set their username & password correctly in their mail client to be able to send mail through this server. If you are using "sambar webmail", the authentication is done internaly by sambar.

Johannes
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