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Date: Thu, 23 Apr 2020 17:58:06 +0200
From: Claus Assmann <>
Subject: Re: spoofing of local email sender via a homoglyph attack

On Thu, Apr 23, 2020, PromiseLabs Pentest Research wrote:

> It's related to the from header.

> 220 *** OMITTED *** ESMTP Postfix
> mail from:
> 250 2.1.0 Ok

1. The correct syntax is
MAIL From:<>
See RFC 5321 no spaces, and <> around the address.

2. That's the envelope sender, not "the from header"
You can probably use
in the header even without authentication (I haven't tried it; I
do not have postfix installed).

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