X-Originating-IP is a de facto standard email header field 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.
X-Originating-IP is a de facto standard email header field 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.
Source: Wikipedia "X-Originating-IP" · CC BY-SA 4.0
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