Hi all, Thank you for your reply. I like to put my question again clearly, since I am still in a confused state. our web,email,DNS servers are all in one machine which is having a public IP natted against private IP in the firewall. Now I want to install a mailgateway which scans for viruses and then automatically sends the mail to mail server and again viceversa(from mail server the mails has to go to mailgateway and then out. Geetha Thanu Bioinformatics CDFD,Hyderabad. - -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list