Remove/hide sender's ip from postfix?

[Delaney martin]

Hi, I am trying to hide the client IP from emails sent from Postfix.

Here is an example of what I mean:

Received: from mail.[removed].com (adsl-75-37-61-254.dsl.frs2ca.sbcglobal.net [55.27.21.245])

Notice this line (adsl-75-37-61-254.dsl.frs2ca.sbcglobal.net [55.27.21.245])

I want to remove that line from the email.

Thanks in advance.

[wisly.k]

Here are the steps to Remove Client's IP from Postfix:


Edit Postfix Main Configuration

Open your main.cf file:

sudo nano /etc/postfix/main.cf

Add the following line at the end of the file:

header_checks = regexp:/etc/postfix/header_checks

• The header_checks option allows Postfix to filter email headers using regular expressions.

Create the Header Check File

Now, create the header_checks file:

sudo nano /etc/postfix/header_checks

Add this line to remove any Received: headers containing IP addresses:

/^Received:.*\(.*\[.*\].*\)/ IGNORE

• The IGNORE action completely removes any matching lines from the email headers.

Apply Configuration Changes

After saving the files, run:

sudo postmap /etc/postfix/header_checks

sudo systemctl restart postfix