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Comments
no thats not possible to hidde.
why wyou want it tp be hidden?
Yes this can be removed by your MTA. I use headers_remove on exim, for example.
To protect backend server IPs when the front end is protected by a reverse proxy (like CloudFlare). Exposing a backend IP can assist attackers in going directly to your server and bypassing front-end protection.
ok my bad.
What Jarland said works fine, the way you can hide the Received: from depends if your sending the email from the server you trying to hide or if your sending it via a other server.
If you sending from the server you what to hide could use Amazon Ses or any other transaction email service which remove the Received: from of the server sending the email.
If you sending via a other server if you got root access to it you can do what jarland says just removed the headers containing your server ip your trying to hide in it
Sending via MXroute also strips the backend server IP now days. Just tossing that out there :P
Interesting...that had never occurred to me. I have all my VPSes (and home PCs) email out through a set of VMs serving as relays, mainly to get around Comcast's "no SMTP from our residential IPs" restrictions and keep RBL monitoring to a minimum.
But it had never occurred to me that someone might examine Received headers...hmmm...
I wouldn't worry too much unless your wanting to hide the origin of the email sent via your relay, i run my own mail server too, i don't bother removing the received headers i don't care if someone look's at the header's and see my home or mobile carrier ip address