Configuring Exchange 2003 for SMTP Relay using SMTP Auth

Once you have setup a POP3 account on the 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. 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 587 (smtp submission). This is's alternate SMTP port that should not be blocked by any ISP. Port 587 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 '' 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. If you get any messages 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.

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