Have you created an "IP Packet Filter" to allow outbound SMTP (port 25) mail? Regards, Richard Watkins -----Original Message----- From: arifoff [mailto:arifoff@xxxxxxxxxx] Sent: Friday, 19 April 2002 13:36 PM To: [ExchangeList] Subject: [exchangelist] Exchange with ISA Server http://www.MSExchange.org/ Hi all We r in the process of setting up are new exchange server but some how we are stuck up with its integeration with ISA Server. Our exchange server sitting behined ISA Server (Both servers are physical on same machine) and is connected to ISP by dial up line. Can any body could point out the issues involve in E2K sitting behined ISA Server. We are using SMTP connector with smart host option but some how connector is unable to connect to ISP mail server. As a test case i also tried to use outlook express installed on same machine directly with ISP, it is also not connecting ISP mail server. regards arif