hi,will you explain me in depth "How exactly outlook delivers message to internet domain via exchange 2003 smtp virtual server"?what and how mails are delivered to internet receipients? i need know step by step complete procedure involved.

This link would help you to answer your questions. http://www.msexchange.org/tutorials/Exchange-Server-2003-Mailflow-Part1.html Part1 and Part2. Please let us know if you don't understand any part of it. Thanks. Vishal Ramnani MCITP - Exchange 2007, MCSE Messaging, MCTS - Win 2008 Config

vishal,i have gone through those articles which is published.this is scenario for ex; i hit send button from outlook and it connectes ex istore. how the mail is validated on these; allowed attachment, log, database commit, text or s/smime, and so on....if my way of explaining is confused, give me your number to contact if possible.thanks

Just concentrate on this part of the Post that Vishal gave. MAPI client sends a message to a remote recipient Information Store (Store.exe) receives the message The created MailMsg object is forwarded to the Advanced Queue Engine (AQE) The Message Categorizer from the AQE processes the MailMsg object and splits it into MIME or RTF as necessary The Message Categorizer expands groups and checks defined Message limits on Exchange The MailMsg object is then transferred to the Remote Destination Domain within the AQE The AQE passes the destination address to the Exchange Routing Engine SMTP initiates an SMTP session with the remote SMTP host After the SMTP session with the remote host has been established, the information store retrieves the body of the message and converts the message as necessary SMTP sends the Message from the Queue to the Remote Host Just to add to this is the MX record of the remote domain. On the Public DNS server the MX record for remote domain will get resolved and it be delivered to that IP address , which can be a FW or an Anti spam device or any device on the perimter network.Raj

Then i would suggest you to know more about Categorizer , DSAccess , Routing Engine , SMTP Connectors , Extensible Storage Engine etc. Since this is a vast subject, i would advise you to hit some books or Technet to know more about them. The questions should answered there. Hope these helps. Thanks. Vishal Ramnani MCITP - Exchange 2007, MCSE Messaging, MCTS - Win 2008 Config

thanks vishal.i am almost satisfied with this.as you said, i'll look into those BOLD words...