It'll step you through the information you need to enter, run the test for you, and then give you the results. Give it a try! What do you need to know before you begin?Įxchange permissions don't apply to the procedures in this topic. These procedures are performed in the operating system of the Exchange server or a client computer. This topic shows you how to use Telnet Client, which is included with Windows. Third-party Telnet clients might require syntax that's different from what's shown in this topic. The steps in this topic show you how to connect to an Internet-facing server that allows anonymous connections using 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. 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. You might notice some Receive connectors that use TCP port 2525. These are internal Receive connectors and aren't used to accept anonymous SMTP connections. If you're testing a connection on a remote messaging server, you should run the steps in this topic on your Exchange server. 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. ), you prevent any default DNS suffixes from being unintentionally added to the domain name. ![]() The output of the command looks like this: mx preference=10, mail exchanger = į mx preference=20, mail exchanger = You can use any of the host names or IP addresses that are associated with the MX records as the destination SMTP server. A lower value for preference (preference = 10 vs. Multiple MX records and different values of preference are used for load balancing and fault tolerance. 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. In this example, we're going to use the following values. Sender's e-mail address: Recipient's e-mail address: Message subject: Test from Contoso.When you run the commands on your server, replace these values with ones for your organization's SMTP server, domain, etc. The commands in the Telnet Client aren't case-sensitive. The SMTP command verbs in this example are capitalized for clarity. You can't use the backspace key in the Telnet session after you connect to the destination SMTP server. If you make a mistake as you type an SMTP command, you need to press Enter, and then type the command again. ![]() Unrecognized SMTP commands or syntax errors result in an error message that looks like this: 500 5.3.3 Unrecognized command. Open a Command Prompt window, type telnet, and then press Enter.
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