Connection Filtering is used to block connections based on the use of an RBL service, Sender Filtering is based on the From field. http://www.microsoft.com/technet/prodtechnol/exchange/guides/E2k3TransnRouting/4aa4b87f-ff18-4667-89f3-1791cfc0f396.mspx?mfr=true Mark Fugatt Dedicated Supportability Engineer (Exchange) Microsoft Limited Desk: +44 (0)118 909 5630 Mobile: +44 (0)7966 858108 MSN IM: markfu@xxxxxxxxxxxxxxxxx Blog: http://blogs.technet.com/mfugatt Dedicated to proactively supporting Microsoft's enterprise Customers If you have any feedback about my work, please let either myself or my manager Andy Gitsham know at andygi@xxxxxxxxxxxxx <mailto:andygi@xxxxxxxxxxxxx?subject=Feedback%20on%20Mark%20Fugatt%20(Exchange%20DSE)> or telephone +44 118 909 3233 ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Shahir Ahmed Ansari Sent: 13 April 2006 07:38 To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Connection filtering vs sender filtering Hi every one, can anyone tell me what's the difference b/w Connection filtering and sender filtering? Regards, Shahir ________________________________ Love cheap thrills? Enjoy PC-to-Phone calls to 30+ countries <http://us.rd.yahoo.com/mail_us/taglines/postman9/*http:/us.rd.yahoo.com/evt=39666/*http:/beta.messenger.yahoo.com/> for just 2¢/min with Yahoo! Messenger with Voice.