SendMail sending garbage mails

[Duncan]

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 at yahoo.com>
To: "Duncan" <drack at mweb.co.zw>; "General Red Hat Linux discussion list"
<redhat-list at 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 at 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 at 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 at 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 at centrum.cz
> > >
> > > The original message was received at Thu, 15 Jul
> > 2004
> > > 21:14:34 +0530
> > > from root at localhost
> > >
> > >    ----- The following addresses had permanent
> > fatal
> > > errors -----
> > > craig at abc.net
> > >     (reason: 550 5.1.1 User unknown)
> > >    ----- Transcript of session follows -----
> > > 550 5.1.1 craig at abc.net... User unknown
> > >
> > > could any one please tell me how to stop this.
> > > redhat-list mailing list
> > > unsubscribe
> >
> mailto:redhat-list-request at 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 at redhat.com?subject=unsubscribe
> > https://www.redhat.com/mailman/listinfo/redhat-list
> >
>
>
>
>
>
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