Re: SendMail sending garbage mails

From: Duncan (drack_at_mweb.co.zw)
Date: 07/28/04

  • Next message: ssoss S: "cannot telnet port 25 from other hosts" 
    To: "Nilesh" <niluforalways@yahoo.com>, "General Red Hat Linux discussion list" <redhat-list@redhat.com>
Date: Wed, 28 Jul 2004 14:39:50 +0200

    if it was ipchains you would do the follwoing ;

    #allowing localhost
      /sbin/ipchains -A input -j ACCEPT -p all -s localhost -d localhost -i lo
      /sbin/ipchains -A output -j ACCEPT -p all -s localhost -d localhost -i lo

    #Deny packets from internet claiming to be from localhost and log
      /sbin/ipchains -A input -j REJECT -p all -s localhost -i ppp+ -l

    Basically that should solve your problems for now that is u dont have a
    machine on your LAN spamming
    Rgds

    Duncan
    ----- Original Message -----
    From: "Nilesh" <niluforalways@yahoo.com>
    To: "Duncan" <drack@mweb.co.zw>; "General Red Hat Linux discussion list"
    <redhat-list@redhat.com>
    Sent: Wednesday, July 28, 2004 2:31 PM
    Subject: Re: SendMail sending garbage mails

    > Hi Duncan,
    >
    > yeah I have configured IPtables firewall on that
    > machine and blocked incoming packtes for other ports
    > except 25 port and 110
    > but not blocked loopback do u feel this problem is
    > because of loopback
    >
    > Regards
    > Nilesh
    >
    >
    >
    > --- Duncan <drack@mweb.co.zw> wrote:
    >
    > > > Hi friends,
    > > >
    > > > I have some problems with my sendmail server.
    > > > it has sending some garbage mails to outside and
    > > that
    > > > mails bouncing back to on different user that is
    > > not
    > > > existing users.
    > > > the error are like
    > > > ----- The following addresses had permanent fatal
    > > > errors -----
    > > > vbqdfwhgvokn@centrum.cz
    > > > (reason: 550 5.5.1 No such user here)
    > > >
    > > > ----- Transcript of session follows -----
    > > > ... while talking to data2.centrum.cz.:
    > > >
    > > > >>>>>> DATA
    > > >
    > > > <<< 550 5.5.1 No such user here
    > > > 550 5.1.1 vbqdfwhgvokn@centrum.cz... User unknown
    > > > <<< 503 5.5.2 Waiting for RCPT command
    > > >
    > > > Subject:
    > > > Returned mail: see transcript for details
    > > > From:
    > > > Mail Delivery Subsystem <MAILER-DAEMON>
    > > > Date:
    > > > Thu, 15 Jul 2004 21:14:34 +0530
    > > > To:
    > > > vbqdfwhgvokn@centrum.cz
    > > >
    > > > The original message was received at Thu, 15 Jul
    > > 2004
    > > > 21:14:34 +0530
    > > > from root@localhost
    > > >
    > > > ----- The following addresses had permanent
    > > fatal
    > > > errors -----
    > > > craig@abc.net
    > > > (reason: 550 5.1.1 User unknown)
    > > > ----- Transcript of session follows -----
    > > > 550 5.1.1 craig@abc.net... User unknown
    > > >
    > > > could any one please tell me how to stop this.
    > > > redhat-list mailing list
    > > > unsubscribe
    > >
    > mailto:redhat-list-request@redhat.com?subject=unsubscribe
    > > >
    > > https://www.redhat.com/mailman/listinfo/redhat-list
    > >
    > > Well you definately need a firewall on your loopback
    > > interface which does
    > > not allow outside packets to connect except yo ISP
    > > to smtp port
    > > etc..Basically do not allow packets from the outside
    > > .Else u have a machibe
    > > in your LAN with a virus that is spamming , u iwll
    > > have to monitor your
    > > maillog .
    > > Wat do others think ????
    > > Rgds
    > >
    > > Duncan Rack
    > >
    > >
    > > --
    > > redhat-list mailing list
    > > unsubscribe
    > >
    > mailto:redhat-list-request@redhat.com?subject=unsubscribe
    > > https://www.redhat.com/mailman/listinfo/redhat-list
    > >
    >
    >
    >
    >
    >
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