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X-Originating-IP

The X-Originating-IP (not to be confused with X-Forwarded-For) email header field is a de facto standard for identifying the originating IP address of a client connecting to a mail service's HTTP frontend. When clients connect directly to a mail server, its address is already known to the server, but web frontends act as a proxy which internally connect to the mail server. This header can therefore serve to identify the original sender address despite the frontend.

Format

The general format of the field is:

X-Originating-IP: [198.51.100.1]

Origins

In 1999 Hotmail included an X-Originating-IP email header field that shows the IP address of the sender. As of December 2012, Hotmail removed this header field, replacing it with X-EIP (meaning encoded IP) with the stated goal of protecting users' privacy.

References

(1999-09-22). "Q&A: Fighting Spam at MSN Hotmail". Microsoft.com.
Declan McCullagh. (2001-06-16). "The Wrong Way to Do Dirty Tricks". Wired.com.
[https://answers.microsoft.com/en-us/windowslive/forum/email/emails-from-hotmail-no-longer-present-x/eefd1c90-7b29-4c8c-ae35-6a97d43a7585 what does X-EIP mean in an email message source]

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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