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@xxxxxxxxxx> 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@xxxxxxxxxx > > (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@xxxxxxxxxxxxx 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@xxxxxxxxxx > > > > 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@xxxxxxx > > (reason: 550 5.1.1 User unknown) > > ----- Transcript of session follows ----- > > 550 5.1.1 craig@xxxxxxxxxx User unknown > > > > could any one please tell me how to stop this. > > redhat-list mailing list > > unsubscribe > mailto:redhat-list-request@xxxxxxxxxx?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@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage! http://promotions.yahoo.com/new_mail -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
