Hi sparkly,
Can you post an example of the
Yahoo full email headers?
In Yahoo you'll see several IP's in the various received lines, a few of them are Yahoo servers, and a received via HTTP header line near the bottom, if it exists, that lists the senders IP address.
Received: from [
a.b.c.d] by web125602.mail.ne1.yahoo.com via HTTP; Tue, 06 May 2014 09:14:49 PDTAfter sending a few tests I noticed that Yahoo does not include the senders IP address in every outgoing email anymore.
It seems like it's usually included if the user is using basic Yahoo Mail and/or have conversations turned off, but the senders IP address is less likely to be included if they are using the full featured Yahoo Mail and/or have conversations turned on.
It's possible that Yahoo is following the privacy trend and phasing in changes to their servers and may stop including the senders IP address for all senders from all servers.