I receive fake emails with several addresses in "From:". For example:
Return-Path: <firstname.lastname@example.org> X-Original-To: Delivered-To: Received-SPF: None (mailfrom) identity=mailfrom; client-ip=126.96.36.199; helo=peewee.webdevworld.com; email@example.com; receiver=<UNKNOWN> Received: from peewee.webdevworld.com (peewee.webdevworld.com [188.8.131.52]) ... Date: Tue, 13 Nov 2018 10:51:03 -0500 From: John Sample <firstname.lastname@example.org> <email@example.com> To:
The email seems sent by firstname.lastname@example.org (It is one of our real contacts) but the real sender is email@example.com
I want to deny emails with multiple addresses in the FROM field. What tool or postfix parameter can I use to stop this?
I use Postfix 3.3 + ESET Mail Security + RBL + SPF