What is the "sender recipient blocking trick with the batch file"? AFAIK Microsoft did not build-in any whitelisting that would allow domains or addresses to bypass IMF action. Proper or improper, it just isn't there. I would welcome anyone to prove me wrong on that. It's a sore omission, and one that ought to be corrected at some point, but I suspect the correction, if any, will require E12. Carl _____ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Marcel Stangenberger Sent: Wednesday, August 23, 2006 3:07 PM To: exchangelist@xxxxxxxxxxxxx Subject: IMF Whitelist Hi All, i've been wondering if their is any "proper" or "inproper but good working" way to do whitelisting of domains in exchange 2003 running IMF v2. I've tried the sender recipient blocking trick with the batch file but this causes a lot of headaches when e-mail adresses of recipients are not rewritten but simply aliased on a unix box before it comes to the exchange box. I did see some 3th party tools offering whitelisting capabilities to IMF but i don't want to resort to buying any except as a last resort. any information would be most appriciated. Cheers, Marcel