How to forge Received header when sending from Mac Mail?

When I use Mac Mail to send a message, it has a received header included in it. Even though I'm running my SMTP through a remote server, my IP shows up (where it's 123.123.开发者_开发问答123.123).

Received: from [123.123.123.123] (host.of.my.ssh.tunnel.com [x.x.x.x])

I've seen many messages where it says:

Received: from my.own.domain.com (host.of.my.ssh.tunnel.com [x.x.x.x])

Is there any way to change [123.123.123.123] to my.own.domain.com in Mac Mail?

Leaving aside my concerns about why you want to hide this data, it's not your Mac Mail program that's inserting this data, it's the remote mail server, so unless you control that server and what data it puts into the headers, you're out of luck.

If you really need to send mail anonymously, and don't control the target mail server in this case, you could use an anonymous relay service, like the variety which come with many domain registrar's whois privacy products.