I've been searching for an answer to this, and I can't seem to find anything. On our Exchange server, we host our primary domain, call it domaina.com, and also host email for another company, call it domainb.com. When someone sends an email to a non-existant user in domainb.com, the NDR generated comes from MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@domaina.com. Is there some way to change that so that NDRs for domainb.com come from MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@domainb.com?

I guess I should mention the Exchange environment is 2007 SP2.

Hi,Exchange NDR setting is applied for the whole Exchange Organization. Thus, it's impossible to set two NDR addresses for the internal NDR.ThanksAllen

Thanks for the reply, good to know.