Comment éviter ces messages ? Mail Delivery Subsystem

AndreS · Octobre 2, 2025, 1:34

Bonjour,

Je reçois des centaines de mails du genre
Mail Delivery Subsystem <MAILER-DAEMON@mail146c50.megamailservers.eu>

The original message was received at Thu, 2 Oct 2025 13:18:55 +0000 from 9.mo581.mail-out.ovh.net [46.105.60.248]

----- The following addresses had permanent fatal errors ----- michaelmartens8@o2mail.de

(expanded from: michaelmartens8@o2mail.de)

----- Transcript of session follows -----

550 5.1.1 michaelmartens8@o2mail.de... User unknown..

J'ai changé mon mot de passe, mais rien n'y fait ...
Merci

fritz2cat · Octobre 2, 2025, 9:48

Bonjour,

Si vous lisez le message d'erreur "michaelmartens8@o2mail.de... User unknown.." il me semble que le niveau d'anglais est accessible à tout le monde.

User unknown , ça veut dire que votre destinataire n'existe pas.

AndreS · Octobre 3, 2025, 8:19

Merci

Si c'était via un formulaire d'un site... je verrais l'origine du formulaire...? non?

Comment trouver quel formulaire est en cause ?

fritz2cat · Octobre 3, 2025, 8:48

Merci de poster l'entièreté d'un mail, avec les en-têtes SMTP et l'intégralité du mail qui est joint au message d'erreur.

Vous pouvez le coller sur pastebin.com et indiquer ici le lien.

AndreS · Octobre 3, 2025, 9:49

Meric ci-joint

fritz2cat · Octobre 3, 2025, 10:03

Vous n'avez rien joint.

AndreS · Octobre 3, 2025, 10:31

oups et là ?

AndreS · Octobre 3, 2025, 10:32

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fritz2cat · Octobre 3, 2025, 10:34

ça c'est le message d'erreur. Avec ce message d'erreur,il doit y avoir une pièce jointe. Celle-ci nécessite d'être examinée pour savoir d'où le mail a été émis.

fritz2cat · Octobre 3, 2025, 10:35

ça c'est le message d'erreur.
Avec ce message d'erreur,il doit y avoir une pièce jointe.
Celle-ci nécessite d'être examinée pour savoir d'où le mail a été émis.

AndreS · Octobre 3, 2025, 1:46

ci-joint..

AndreS · Octobre 3, 2025, 1:47

aa

AndreS · Octobre 3, 2025, 1:48

L’objet

Undelivered Mail Returned to Sender

L’expéditeur

MAILER-DAEMON@mo582.mail-out.ovh.net

Destinataire

postmaster@autan.org

Le message This is the mail system at host mo582.mail-out.ovh.net.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

The mail system

<annaschmidt@t-online.de>: host mx00.t-online.de[194.25.134.8] said: 550-5.1.1

user unknown 550 5.1.1 Unknown recipient. (in reply to RCPT TO command)

Le fichier attaché
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6) L’entête

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X-Ovh-Spam-Status: OK

X-Ovh-Spam-Reason: vr: BOUNCE; dkim: disabled; spf: disabled

X-Ovh-Message-Type: BOUNCE

fritz2cat · Octobre 3, 2025, 2:33

Ce n'est pas ça. Je vous envoie un e-mail.

fritz2cat · Octobre 3, 2025, 3:12

Merci pour votre réponse à mon e-mail.

Vous avez quelqu'un à l'adresse IP 172.94.113.165 (localisation inconnue - probablement un opérateur VPN) qui utilise votre boîte postmaster@autan.org et son mot de passe pour spammer tous azimuths.

Changez le mot de passe de la boîte postmaster.

La pièce jointe contient ceci:

Received: from autan.org ([37.59.142.111])
	by ghost-submission-bb9d666dc-n9ckf with ESMTPSA
	id jmeLDR563mj87gAAlPxnyg
	(envelope-from <postmaster@autan.org>)
	for <clemensfemmer@vodafone.de>; Thu, 02 Oct 2025 13:11:58 +0000
From: "Romy Kitzmann" <postmaster@autan.org>
To: "Clemens" <clemensfemmer@vodafone.de>
Subject: =?UTF-8?Q?=E2=9C=A8_Warum_ist_Schwung_manchmal_so_?=
	=?UTF-8?Q?zerbrechlich=3F_Ich_frage_mich_das?=
	=?UTF-8?Q?_auch.?=
Date: Thu, 2 Oct 2025 15:11:55 +0200
Message-ID: <0AF0C87D65B6B03355E6DE3FAC7D353E985F@autan.org>
MIME-Version: 1.0
Content-Type: multipart/alternative;
	boundary="----=_NextPart_000_0002_01DC3487.6410BC80"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Windows Live Mail 14.0.8117.416
Authentication-Results: garm.ovh; auth=pass (GARM-111S0050930a600-6d6d-4c05-8540-c89b4d62e6a3,
                    2ABA36FFEBF134BC5D3F72426CEB0BAB17C777A5) smtp.auth=postmaster@autan.org
X-OVh-ClientIp: 172.94.113.165

AndreS · Octobre 3, 2025, 4:05

Merci beaucoup.. j'ai donc changé le mot de passe.. on va voir :) Merci encore !

fritz2cat · Octobre 3, 2025, 4:14

Après il faudra vous demander comment ce mot de passe est tombé dans de mauvaises mains..., peut-être l'avez-vous introduit sur un écran de phishing ? ou bien votre PC est infecté ?