Sendmail Masquerading

[myx9]

I want to masquerade IP address from e-mail header message for LAN computers, to server IP address.
In LAN I have private ip address and I want e-mail header to contain the ip address of the server.
Can you help me please?

[Roxoff]

It's more likely that the reason your mail is showing the client email address is that your mail client is sending straight to your ISP's mail server. If your mail server is configured correctly, you should be able to dump all outgoing mail to your own sendmail box.

While this wont remove your client email address from the mail, it will show the hop at your own mailserver, and the information you want included will be there.