Configuring Exchange 2003 for SMTP Relay using SMTP Auth

Written by ChangeIP.com

Once you have setup a POP3 account on the ChangeIP.com system to allow
relaying of mail you can follow the instructions below to setup your Exchange
server to relay mail through our servers.  Our servers allow relaying using
any domain as a from address that you've added underneath your email account
screen.  This means that you should add every domain that your Exchange
server will send mail as to your account on our site.  The POP3 email
address that you setup can be any name that you want.  Most installation
use a generic mailbox name like 'relay@mydomain.tld' or 'smtp@mydomain.tld'. 

Step 1.

Using Exchange System Manager navigate to the 'Servers' container. 
Now drop down the 'Protocols' container.  Next find the 'SMTP'
protocol and select 'Default SMTP Virtual Server'.  Right click on
the default smtp virtual server and choose 'Properties'.  You should
be at a screen that looks like the one below.

Step 2.

Click on the 'Outbound Security...' button.  This is where you
will enter the User ID (email address) and password of the pop3 mailbox that
you've setup on our system.  Choose 'Basic authentication'. 
Exchange 2003 uses the term Basic Authentication, whereas it really is SMTP AUTH
to the rest of the internet community.  The user name is not case
sensitive, but it must include the full email address including domain name. 
The password is case sensitive.  You may check 'TLS encryption' if
you wish, but it is not required.  Click OK when done on this screen.

Step 3.

Click on 'Outbound connections...' on the delivery tab.  This
will show you what outgoing SMTP port number you are configured to use, as well
as some connection limits.  If your ISP is blocking port 25 and you need
to get around it you can enter port 5072.  This is ChangeIP.com's
alternate SMTP port that should not be blocked by any ISP.  Port 5072
functions exactly the same as port 25, except that it's not blocked by your ISP. 
We recommend leaving the outbound port to 25 unless you experience this blocked
port by your ISP.  The other connection limits are changed from the
defaults to protect your connection from being flooded by too much mail flowing
outbound.  Click OK when done configuring this screen.

Step 4.

Click on 'Advanced' on the main delivery options tab.  Your fully
qualified domain name should be the domain that is appended to all of your
outgoing mail.  In order to get mail to relay through our servers you will
need to setup the 'Smart host' setting on this screen.  This is what
tells Exchange to delivery all mail destined for the internet though our
servers.  Use 'SMTP.ChangeIP.com' for your smart host.  All
mail being delivered to the internet will be handed off to this smart host
server.  Click OK when completed on this screen.

Step 5.

After you've completed the above steps you will need to restart your SMTP
service for all changes to take effect.  Any mail that is currently in the
queue might not take these new settings so you might need to send a new piece of
mail to test it.  After sending a test email you will want to check the
outbound queue on Exchange to make sure that the mail did not get stuck in your
outbound queue because of authentication errors.  Navigate to the screen
below to check this.  In the screenshot below you can see that an email was
sent to GMAIL.COM and it is still pending in the queue.  Click on any line
that has pending messages and you will see error status at the bottom.  You
can see that this mail failed because of SMTP AUTH on the remote server. 
This means that the username and password that you've entered for relaying is
not valid.  Double check the user ID (email address) and password that
you've configured and try again.

Conclusion.

Congratulations on the configuration of Exchange 2003 and the SMTP relay
ability that we provide.  If you have any questions or need more help
setting this up please feel free to email our support department.