Email Address Verification
Is there a way to force the exchange server to do a return address lookup to verify the address exists. I could eliminate so much spam that way. Platform Exchange 2003 and 2007. Thanks
October 19th, 2007 3:15pm

Yes you can do this This is the procedure for Exchange 2003 Enable directory lookup for recipients in the recipient filter Open Exchange System Manager. Open Global Settings, right-click on Message Delivery, choose Properties Choose the "Recipient Filtering" tab Check the box "Filter recipients who are not in the Directory" Click OK to close. Enable the recipient filter on the SMTP protocol binding that accepts mail from the Internet Navigate to the SMTP Virtual Server that listens on the Internet (repeatall of these steps if you have more than one) Right-click on the SMTP Virtual Server, choose Properties On the "General" tab (already open), click the "Advanced..." button next to IP address Choose the IP/port binding that corresponds to the one that listens on the Internet. Either double-click or click the "Edit..." button. Click the checkbox next to "Apply Recipient Filter" Click OK three times to close this. Now, when someone does a RCPT TO: someunknownuser@domain, they will get a: 550 5.5.1 User unknown For Exchange 2007 you can look here http://technet.microsoft.com/en-us/library/78cc46ea-d8fc-4d0f-837b-c485ad2ae5d5.aspx Deli
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October 19th, 2007 6:26pm

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