Dear Tiago Checked KB Article - 196626 .The thing is if I enter the Ip address of Servers as 1.1.1.1 with Mask 255.255.255.0 the servers are unable to relay.But if i enter IP as 1.1.1.1 & mask 255.255.255.255 it works.Can you tell me whether 1.1.1.1 255.255.255.0 should work or not. Thanks Harinder -----Original Message----- From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx] Sent: Friday, January 30, 2004 4:45 PM To: [ExchangeList] Subject: [exchangelist] RE: Relaying Problem http://www.MSExchange.org/ Hey Harinder, Once i had this very same problem. Search MSKB http://support.microsoft.com for how to set relay restrictions on the registry. I remember that if I set them on Exchange Administrator it wouldn't work. Only via registry. Good luck! -----Original Message----- From: Harinder Singh [mailto:harinders@xxxxxxxxxxxx] Sent: sexta-feira, 30 de janeiro de 2004 06:53 To: [ExchangeList] Subject: [exchangelist] RE: Relaying Problem http://www.MSExchange.org/ Thanks Tiago I was implimenting VPN in Site 2.When i give a valid IP on the Server it becomes an open relay.To prevent that i added the Ip`s of servers in Site 3 & Site 4 in Routing restrictions.But the problem is they get unable to relay error. Thanks Harry -----Original Message----- From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx] Sent: Wednesday, January 28, 2004 10:59 PM To: [ExchangeList] Subject: RES: [exchangelist] Relaying Problem http://www.MSExchange.org/ This is a multi-part message in MIME format. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------