Difference between Exchange SMTP connector and virtual server

I'm an experienced networking type and Unix admin trying to muddle my way thru configuring an Exchange 2003 server for the first time (I know, that's my first mistake...)

Trying to understand the difference between the SMTP connector and the SMTP virtual server.  In particular, it appears that you can configure a smart smtp relay in either place.  I want our outbound e-mail to go via our ISP's (user name and password protected) relay since direct mail from us seems to be increasingly bounced by suspect MTAs who don't trust small unknown MTAs.

Anyway, by trial and error it does appear that configuring the smart relay in the connector works, but not in the smtp virtual server, but I'd like to understand why.  Why is there this distinction between the connector and virtual server, and what is the reason for each esp. when many of the properties appear to be duplicated in both.

Randy
rlfrankAsked:
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ikm7176Connect With a Mentor Commented:
SMTP virtual server:
An SMTP virtual server is an SMTP protocol stack (a process or server that both receives e-mail messages and acts as a client for sending e-mail messages). Each SMTP virtual server represents an instance of the SMTP service on a server. An SMTP virtual server is defined by a unique combination of an IP address and port number. The default SMTP virtual server uses all available IP addresses on the server and uses port 25 for inbound connections. A single physical server can host many virtual servers.
You use Exchange System Manager to control most of the SMTP settings.

SMTP Connector:
SMTP relies on DNS to determine the IP address of its next destination server. To send mail directly to an external mail server, an SMTP connector must use DNS to resolve external domain names. Alternatively, the connector can simply forward mail to a smart host that assumes responsibility for DNS name resolution and delivery.

For setting Authentication see the link below

http://www.christopherlewis.com/ATT_SMTP_Config.htm 
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