Did Yahoo stop collecting source IP addresses in the email headers?

Hello,

To find the source IP address of an email sent from Yahoo mail you will need to look at the Yahoo full email headers.

The line you are looking for is the HTTP header line that will look similar to:

Received: from [x.x.x.x] by web38904.mail.mud.yahoo.com via HTTP

where do I find the sender's ip address? as of a month ago, it is missing from yahoo email header

It doesn't appear to be possible anymore. If I sent direct Yahoo to Yahoo it shows a received from "sonic gate" type of name and no information about the sender's IP address.