To find a sender’s IP address from an incoming email in Outlook, please do as follows:

1. Double click to open the specified email whose sender’s IP address you will find.

2. In the Message window, please click the anchor  in the Tags group on the Message tab to open the Properties dialog box. See screenshot:

Note: You can also open the Properties dialog box by clicking File > Info > Properties.

3. In the Properties dialog box, go to the Internet headers section, find out the X-Originating-IP field, and you will get the sender’s IP address as following screenshot shown.

Note: In some spams, you are likely not to find out the X-Originating-IP filed in the Internet headers section directly. In this condition, please go ahead with following steps.

4. Put cursor at the Internal Headers section, press Ctrl + A key to select all header information, and then press Ctrl + C keys to copy all header information.

5. Create a new Word document, and press Ctrl + V keys to paste the header information.

And now please look for the IP address embraced with brackets from the pasted header. The sender’s IP address is probably located behind Received field as below screenshot shown.

If you have Kutools for Outlook installed, you can apply its cool Message Header Analyzer feature to get the IP address of sender from an incoming email easily in Outlook.

1. Select the email whose sender IP address you need to get, and click Kutools Plus > Message Header Analyzer.

2. In the Message Header Analyzer dialog, go to the Source data tab, scroll to the Received-SPF section, and you will get the sender IP address. See screenshot: