In this example, we're going to use the following values. Step 3: Use Telnet on Port 25 to test SMTP communication When you're ready to end the Nslookup session, type exit, and then press Enter. Multiple MX records and different values of preference are used for load balancing and fault tolerance. A lower value for preference (preference = 10 vs. You can use any of the host names or IP addresses that are associated with the MX records as the destination SMTP server. The output of the command looks like this: mx preference=10, mail exchanger = į mx preference=20, mail exchanger = ), you prevent any default DNS suffixes from being unintentionally added to the domain name. Remote messaging servers are often set up to make sure the IP address where the SMTP connection is coming from matches the domain in the sender's email address.įor information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts in the Exchange admin center. If you're testing a connection on a remote messaging server, you should run the steps in this topic on your Exchange server. These are internal Receive connectors and aren't used to accept anonymous SMTP connections. You might notice some Receive connectors that use TCP port 2525.
Similarly, if you're trying to reach a server on the Internet from your Exchange server, you need to ensure your Exchange server can open a connection to the Internet on TCP port 25. If you're trying to connect to this server from the Internet, you need to ensure your Exchange server is reachable from the Internet on TCP port 25.
#AUTOMAILER SMTP SERVER HOW TO#
The steps in this topic show you how to connect to an Internet-facing server that allows anonymous connections using TCP port 25. Third-party Telnet clients might require syntax that's different from what's shown in this topic. This topic shows you how to use Telnet Client, which is included with Windows. These procedures are performed in the operating system of the Exchange server or a client computer. Give it a try! What do you need to know before you begin?Įxchange permissions don't apply to the procedures in this topic. It'll step you through the information you need to enter, run the test for you, and then give you the results.
Did you know that, instead of using Telnet to test SMTP connectivity, you can use the Microsoft Remote Connectivity Analyzer at With the Remote Connectivity Analyzer, you can choose the connectivity test you want to do, in this case Inbound SMTP Email, and follow the instructions shown.
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