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If I send someone an email using Outlook online, can the recipient know my IP? I knew before that it was possible but I was wondering if the email providers like Outlook, Gmail had added some sort of security for that?

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  • Why are you worried about someone knowing your IP address?
    – user163495
    Sep 24, 2019 at 10:53
  • When using a webclient, the IP of the device accessing the webclient is not part of the email sending process, so your IP is not passed on.
    – schroeder
    Sep 24, 2019 at 11:37

1 Answer 1

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An e-mail is nothing but text conforming to the SMTP (Simple Mail Transfer Protocol). When accessed through a web client, it appears formatted, but the its source (underlying raw text) can be displayed (in Outlook Web you can click on the three dots on the right side of an e-mail message and then on View message source).

One of the headers present in the source is the Received header, which says where the e-mail was received from. In theory, this could be your personal IP (or domain, if applicable). However, close inspection of the message source will reveal that with most e-mail sending services (Outlook Web itself for example), the Received headers only mention Microsoft server IPs.

If you were to send it yourself however (e.g. by opening a Telnet session to an Outlook SMTP server and sending an e-mail), your IP would indeed be visible by viewing the message source.

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