dear all, i have a littile problem, i have two domains registered with a single ip e,g sol.com at 61.1.1.9 rol.com at 61.1.1.9 so i recieve mails for both domains on my exchange Now what the problem is sol.com somebody is trying to spoof addresses on that domain like e.g i get mails send to recpt ram@xxxxxxx, kam@xxxxxxx, def@xxxxxxx who do not exist in my domain so non delivery mails are generated and get stuck in queue because destination to non delivery reports do not exsist and everytime these fake mails are from different ip address and domains.so it is hard to put senders filter. i am using gfi mail scanner and if try to enable any kind of anylysis or ratings then corporate mails also get undelivered. i am using exchange 2003 or i think if there is any method to stop non delivery reports for particular sol.com. 2. another question : how can i stop delivery reports for internal mails please suggest