I am having problems with numerous spam attacks where they are not trying to relay but rather are trying to guess addresses in my domain (i.e. badguess1@yourdomain.com, badguess2@yourdomain.com). My server then checks and finds that the address is bad (even though it is my domain) and sends an NDR.
How can you configure Exchange to NEVER issue an NDR? Of course, Microsoft's site has no information on this.
How can you configure Exchange to NEVER issue an NDR? Of course, Microsoft's site has no information on this.