I try to understand phishing email received from an attacker:
Received: ....
Received: ....
Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=74.208.4.XX;ip=; helo=mout.gmx.com;helo= envelope-from:attacker@infected_website.com;receiver=victim@legit_site.com
Received: from mout.gmx.com (mout.gmx.com [74.208.4.XX][])
by in14.mail.ovh.net (Postfix) with ESMTPS id 26F1621CXX=
for <victim@legit_site.com>; Mon, 10 Feb 2019 13:06:35 +0100 (CET)
Received: from [IP_SRC] ([IP_SRC]) by
3c-app-mailcom.... (via HTTP); Mon, 10 Feb 2019 13:06:33 +0100
I think the attacker has sent the mail from his GMX account via GMX web interface.
But the envelope-from
contains another address (not gmx email address) where the host is corrupted (infected website) and the user is spoofed.
I do not think gmx could allow this.