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How to find an SMTP port number

Updated April 17, 2017

Networks assign port numbers to different types of incoming and outgoing traffic. One example of this is the port assigned to SMTP (Simple Mail Transfer Protocol), which is used to package and transfer electronic mail, or e-mail. In most cases, SMTP is assigned to port 25 in the network's Exchange server. If you want to find out which port your network uses to route SMTP traffic, you can check it by logging in to the Exchange server.

Log in to the Exchange System Manager in your mail server.

Click "Servername."

Click "Protocols."

Click "SMTP."

Find the icon labelled "Default SMTP Virtual Server" and right-click on the icon.

Select "Properties."

Select the "General" tab and click the button marked "Advanced."

Read the value listed in the entry for Transmission Control Protocol (TCP). This value is the SMTP port used by your network.

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About the Author

Vee Enne is a U.S. Military Veteran who has been writing professionally since 1993. She writes for Demand Studios in many categories, but prefers health and computer topics. Enne has an associate's degree in information systems, and a bachelor's degree in information technology (IT) from Golden Gate University.