SendMail sending garbage mails

[Nilesh]

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
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>
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> 



	
		
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