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 make sure your Exchange server can open a connect to the Internet on TCP port 25. If you're trying to connect to this server from the Internet, you need to make sure your Exchange server is reachable from the Internet on TCP port 25. 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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