edit/modify ESMTPSA LMTP ESMTP

How to edit postfix conf in order to have more officiant details in message view source. Basically remove all the scanner amavisd and localhost details and having only public IP and mail domain name to keep it simple and nifty.

 

Is that like writing a new postfix that logs less info?
You could write a filter script to remove the lines you do not want from the log and use the result.

 

Well
My point is having a nice email headers before the mail could be send away.
So far I have managed ESMTPSA by editing /etc/postfix/header_check by adding:

Code:

/^Received:(.*?)with ESMTPSA(.*?)/ REPLACE Received: from domain.com (domain.com [1.1.1.1]) by mail.domain.com (Postfix) with ESMTPSA$2

it seems like adding two lines to to /etc/amavis/conf.d/50-user

Code:

$smtpd_greeting_banner = 'mail.domain.com ESMTP';
$localhost_name = 'main.domain.com';

Helped LMTP and ESMTP but getting hands on ([127.0.0.1]) require a bit more digging in the documentation.

 

I clean my outgoing mails a bit (for example, hiding the senders IP address and mailing program). With a little manual reading, you should be able to adjust this to your needs: http://www.postfix.org/header_checks.5.html
In /etc/postfix/main.cf:

Code:

smtp_header_checks = pcre:/etc/postfix/header_cleanup_outgoing

In /etc/postfix/header_cleanup_outgoing

Code:

/^\s*(Received: from)[^\n]*(.*)/ REPLACE $1 127.0.0.1 (localhost [127.0.0.1])$2
/^(Received: from)(.*\(.*\))(\s*)((\(.*\)\s*){3})(by.* with ESMTPSA id.*\s*.*)/ REPLACE $1 localhost (localhost [127.0.0.1]) $3$4$6
/^\s*User-Agent/ IGNORE
/^\s*X-Enigmail/ IGNORE
/^\s*X-Mailer/ IGNORE
/^\s*X-Originating-IP/ IGNORE
/^\s*Mime-Version/ IGNORE

[edit]
Get a mail header you want to change and use https://regex101.com/ to create your regex until you get the desired result. Then test with postfix.

 

Works as a charm.
Thank you

 

A small question regarding editing only a small fraction of it. I get that regex does the line match but how to replace a fraction of it. As far as I'm guessing here trick is in perl syntax that corresponding with the right section such as $1,$2. Where can I find does structure and put my hand on it?

 

So another example:
header "Test: hello world Test1: not such hello" it would be:

Code:

/^\s*(Test): (.*)/^\s*(Test1): (.*)/ REPLACE $1-Reply: I got your $2-Reply:I got your1 $3

Is my conclusion right?

 

1. Go to https://regex101.com/
2. On the left side choose "substitution"
3. Everything between the first / and / goes to "REGULAR EXPRESSION" on the top
4. Everything after REPLACE goes to SUBSTITUTION
5. Your Header to change goes to "TEST STRING"

Looks like in the screen shot below. Easy to do with good explanations. Play and have fun. (Was it really so hard?)

 

I am guessing not the last one question. Where is the dkim-signature structure saved. I have one position to add (BIMI) before signing. And the I will post full guide how to add BIMI to ispconfig.

 

What I mean is that. Amavisd creates the dkim verification. What I want to do is add into h= one selector. So the mail will change (current version):

Code:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=domain.com; h=content-type:content-type:mime-version:user-agent:date:date:message-id:subject:subject:from:from;....

to:

Code:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=domain.com; h=BIMI-Selector:content-type:content-type:mime-version:user-agent:date:date:message-id:subject:subject:from:from;....

of course it doesn't have to be in this particular order.
Another words how to add let say another component passing by requires by BIMI:
https://tools.ietf.org/id/draft-blank-ietf-bimi-00.html#bimi-selector
I think I have got it. Some additional software needs to be install