We have exchange server 2007, Is it possible to block teh mails by IP. Thank you very much for the helpful info.

You will need to implement Edge server role. This article is a good entry point for understanding the subject - http://www.petri.co.il/implement-edge-transport-server.htmMCITP: Enterprise Messaging Administrator

Or ISA Server or probably any other firewall product would do that too. -- Ed Crowley MVP "There are seldom good technological solutions to behavioral problems." . "AlexRagel" wrote in message news:31c7a0f7-cf97-4dba-9e25-fe80a07ebae4... You will need to implement Edge server role. This article is a good entry point for understanding the subject - http://www.petri.co.il/implement-edge-transport-server.htm MCITP: Enterprise Messaging AdministratorEd Crowley MVP "There are seldom good technological solutions to behavioral problems."

Or you can enable Anti-Spam functionality on a Hub Transport server. How to Enable Anti-Spam Functionality on a Hub Transport Server http://technet.microsoft.com/en-us/library/bb201691(EXCHG.80).aspxFrank Wang

We have exchange server 2007, Is it possible to block teh mails by IP. Thank you very much for the helpful info. Yes it is possible through Anti-Spam functionality. Thanks Amit Rawat

But not in a DMZ. -- Ed Crowley MVP "There are seldom good technological solutions to behavioral problems." . "Frank.Wang" wrote in message news:b2287057-4419-42cb-a120-ba30011300f4... Or you can enable Anti-Spam functionality on a Hub Transport server. How to Enable Anti-Spam Functionality on a Hub Transport Server http://technet.microsoft.com/en-us/library/bb201691(EXCHG.80).aspx Frank WangEd Crowley MVP "There are seldom good technological solutions to behavioral problems."