Hi All, I'm running an Exchange 2013 server, the IP that its using has been blacklisted for sending out NDRs to email addresses who have fallen victim to spammers. I know on exchange 2010 you could disable DNRs system wide, however I cannot find an option on Exchange 2013, I know that it can be set per domain, but is it possible to disable this system wide? Personally I think that I have protected the server enough with DNS lookups and blacklisting IPs that it shouldn't be receiving spam emails, but one has slipped through. Turning off DNRs i think is wrong, i would want to know if an email I sent wasn't being delivered, but hay ho.. Thanks in advance. Aaron

Found a fix, http://technet.microsoft.com/en-us/library/bb123891.aspx

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