How to Find an SMTP Port Number

Techwalla may earn compensation through affiliate links in this story. Learn more about our affiliate and product review process here.
SMTP is the transmission protocol used for email.

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 email. 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.

Advertisement

Step 1

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

Video of the Day

Step 2

Click "Servername."

Step 3

Click "Protocols."

Advertisement

Step 4

Click "SMTP."

Step 5

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

Advertisement

Step 6

Select "Properties."

Advertisement

Step 7

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

Step 8

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

Video of the Day

Advertisement

Advertisement

references & resources