Uhm so what your saying is there is no way to drop RDNS failed emails correct? Yes I have Reverse lookup enabled on my Exchange for incoming emails, however emails that file still get through, so there has to be an easier way to blacklist the IPs that fail. There mail servers on the net that do just that. Hence if your IP doesn't have a PTR record your company is screwed big time! Regards, Andrew ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Simon Whale Sent: Thursday, June 01, 2006 6:57 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: IMF config Its NOT something that you do with IMF but you can get exchange to do reverse dns checks but be aware that this increases the load on the server http://support.microsoft.com/default.aspx?scid=kb;en-us;319356 Exchange 2000 http://support.microsoft.com/default.aspx?scid=kb;en-us;823019 Exchange 2003 Regards Simon ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew English Sent: 01 June 2006 12:05 To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: IMF config Is there anyway to get IMF to drop emails that fail reverse lookup? Thanks Andrew