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 server.

Contents

Format

The general format of the field is: X-Originating-IP: [xxx.xxx.xxx.xxx]

Where xxx.xxx.xxx.xxx is, this would be an IP address.

Origins

In 1999 Hotmail included an X-Originating-IP email header field that shows the IP address of the sender.[1][2]

See also

References

  1. ^ http://www.microsoft.com/presspass/features/1999/09-22spam.mspx
  2. ^ http://www.wired.com/politics/law/news/2001/06/44567