Yahoo webmail blocked...or? in SpamCop Blocklist Help Posted May 9, 2006 X-originating-IP is a header I found in a webmail (hotmail, by the way) that contains the IP of the actual sender (that is, the IP of the computer/host/router/gateway through which the web browser used to access the webmail communicates) Otherwise I assume that the originating IP of yahoo/hotmail/webmail posts would be some server belonging to the respective webmail operators' servers. I would normally assume that X-originating-IP (nonstandard?) is entirely left out of the question by spamcop, so that you could send mail from any pc from any location without regard to the IP address assignet to you, as long as you could trust your web mail provider. But I'm not sure now.