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.[1][2] 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.[3]

gollark: Also, if you do throw out your existing RAM (don't, keep it somewhere for future use, but I mean if you stop using it), buy 3200MHz DIMMs if they're not much more expensive.
gollark: Why 64GB?
gollark: So just buy two more 3000MHz 8GB DIMMs, the RTX 2∅7∅, and enjoy better fps.
gollark: Or some weird combination, I guess.
gollark: Since you'd need 4x 16GB DIMMs or 2x 32GB.

See also

References
  1. "Q&A: Fighting Spam at MSN Hotmail". Microsoft.com. 1999-09-22. Retrieved 2012-05-28.
  2. Declan McCullagh (2001-06-16). "The Wrong Way to Do Dirty Tricks". Wired.com. Retrieved 2012-05-28.
  3. what does X-EIP mean in an email message source
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