Hi,
Recently I've received an email with fake 'From' that had my local
domain inside. To correctly understand what's wrong there, here are
explanations:
1) my domain is 'flygroup.st'
2) external domain is 'external.org' (just an example)
Sending similar email:
[external.org] # telnet mail.flygroup.st 25
HELO external.org
250 ...
MAIL FROM: <[email protected]>
250 ...
RCPT TO: <[email protected]>
250 ...
DATA
Message-ID: <[email protected]>
From: Me <[email protected]>
To: <[email protected]>
Subject: test
Date: Sun, 21 Dec 2014 13:34:14 -0700
Content-Language: en-us
x-virtual-mta: vmta1
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="UTF-8"
Return-Path: [email protected]
MIME-Version: 1.0
test
.
250 ...
So such email gets delivered fine. And the problem is email client shows
this email as being sent from local domain (so it's possible to put
there local fake sender and people would think it's someone from the
company). I've been checking documentation for both postfix and amavisd,
also found some discussions on this, but no possible solution. Could you
point me in a right direction?
Thanks in advance!
