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Message-ID: <20200423155806.GA6911@kiel.esmtp.org> Date: Thu, 23 Apr 2020 17:58:06 +0200 From: Claus Assmann <ml+oss@...tp.org> To: oss-security@...ts.openwall.com 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: john.doe@...ver.com > 250 2.1.0 Ok 1. The correct syntax is MAIL From:<john.doe@...ver.com> See RFC 5321 et.al: no spaces, and <> around the address. 2. That's the envelope sender, not "the from header" You can probably use From: john.doe@...ver.com in the header even without authentication (I haven't tried it; I do not have postfix installed).
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