Well, That's what I'm trying to determine. Obviously, if the box that ISA is sitting on is running SMTP and messages terminate there, GFI will work. My question deals with how messages are relayed through ISA that is publishing an SMTP server that isn't local to it. So, you have the following: SMTP sender -> hardware firewall -> ISA w/ SMTP Published Server -> hardware firewall -> SMTP server Allow any to ISA Requests come from ISA Allow ISA to SMTP Even in the above case, do messages still hit the Drop directory on the ISA box and are then placed in the Pickup directory, and then sent onward by SMTP service running on the ISA box? Cordially yours, Jerry G. Young II MCSE (4.0/W2K) Atlanta EES Implementation Team Lead HHS Engineering Unisys 11493 Sunset Hills Rd. Reston, VA 20190 Office: 703-579-2727 Cell: 703-625-1468 THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. ________________________________ From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] Sent: Tuesday, January 24, 2006 4:08 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: ISA 2004 Enterprise Edition and SMTP http://www.ISAserver.org Hi Jerry, Why would you think it would not work? Tom Thomas W Shinder, M.D. Site: www.isaserver.org <http://www.isaserver.org/> Blog: http://spaces.msn.com/members/drisa/ <http://spaces.msn.com/members/drisa/> Book: http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7> MVP -- ISA Firewalls **Who is John Galt?*