Yes, saw you editited your post.
Blockquote[quote=“Gary, post:4, topic:67424”]
Still, it’s added by the server. you will see the same whatever email client you are using.
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It’s the primary decision of emClient to send that information out.
Thunderbird can be configured to hide the LAN-IP or to provide a fake-IP. Just edit mail.smtpserver.default.hello_argument to localhost and within the extended HELO the client (eg Tunderbird) provides “localhost” to the Server.
So, this would be a feature-request.