Facebook Mail false positiv

TheBit

TheBit

Member
Oct 26, 2021
17
1
8
40
Berlin
Hallo, wir stellen fest, dass original Facebook Mails als Spam eingestuft werden, der SPF Check ist auch positiv, wie kann man diesen false/positiv umgehen?

1685108067033.png
 
Hmm - spannend - kurz die Nachfrage - ist es tatsächlich ein legitimes mail? (ich würde nochmal die header genau anschauen)

Ansonsten als Tip wie in so einem Fall vorgegangen werden kann um herauszufinden was genau passiert:
Code: 
grep -r FACEBOOKMAIL /var/lib/spamassassin/
...
4.000000/kam_sa-channels_mcgrail_com/KAM.cf:header              __KAM_FACEBOOKMAIL1     From =~ /\@facebookmail.com/i
4.000000/kam_sa-channels_mcgrail_com/KAM.cf:header              __KAM_FACEBOOKMAIL2     From =~ /Ramakanth Raavi/i
4.000000/kam_sa-channels_mcgrail_com/KAM.cf:meta                KAM_FACEBOOKMAIL        ((__KAM_FACEBOOKMAIL2 >= 1) || (__KAM_FACEBOOKMAIL1 >=1 && (SPF_FAIL + DKIM_ADSP_ALL >=1)))
...
sprich die regel springt an (für den fall relevant), wenn im from-header @facebookmail.com vorkommt, und SPF_FAIL oder DKIM_ADSP_ALL anspringen - (die 2 rules koennen dann ebenso mit grep gesucht werden) - in dem fall ist SPF_PASS - damit ist DKIM das problem (und wie angezeigt ist DKIM_INVALID auch angesprungen)

eine Möglichkeit warum das bei einer legitimen mail passieren kann, ist, dass die Max Spam Size (GUI->Configuration->Spam Detector->Options) kleiner ist als die mail (PMG liefert dann an spamassassin nur den abgeschnittenen teil des mail-inhalts - und da ist der body-hash dann falsch)

Ich hoffe das hilft!
 
Ich habe den Header eingefügt, für mich sieht das legitim aus. Die Mail ist nur 16KB Groß - sehen Sie hier einen Fehler?


Code: 
/var/lib/spamassassin/3.004006/kam_sa-channels_mcgrail_com/KAM.cf:#FAKE FACEBOOKMAIL
/var/lib/spamassassin/3.004006/kam_sa-channels_mcgrail_com/KAM.cf:header                __KAM_FACEBOOKMAIL1     From =~ /\@facebookmail.com/i
/var/lib/spamassassin/3.004006/kam_sa-channels_mcgrail_com/KAM.cf:header                __KAM_FACEBOOKMAIL2     From =~ /Ramakanth Raavi/i
/var/lib/spamassassin/3.004006/kam_sa-channels_mcgrail_com/KAM.cf:meta          KAM_FACEBOOKMAIL        ((__KAM_FACEBOOKMAIL2 >= 1) || (__KAM_FACEBOOKMAIL1 >=1 && (SPF_FAIL + DKIM_ADSP_ALL >=1)))
/var/lib/spamassassin/3.004006/kam_sa-channels_mcgrail_com/KAM.cf:describe      KAM_FACEBOOKMAIL        Fake or Abused Facebook Mail
/var/lib/spamassassin/3.004006/kam_sa-channels_mcgrail_com/KAM.cf:score         KAM_FACEBOOKMAIL        8.0

Code: 
Delivered-To: xxx@xxx.de
Return-Path: friendupdates@facebookmail.com
Received-SPF: pass (facebookmail.com: 66.220.144.143 is authorized to use 'friendupdates@facebookmail.com' in 'mfrom' identity (mechanism 'ip4:66.220.144.128/25' matched)) receiver=pmg2.bitskin.de; identity=mailfrom; envelope-from="friendupdates@facebookmail.com"; helo=66-220-144-143.mail-mail.facebook.com; client-ip=66.220.144.143
Received: from 66-220-144-143.mail-mail.facebook.com (66-220-144-143.mail-mail.facebook.com [66.220.144.143])
    by pmg2.xxxx.de (Proxmox) with ESMTPS id 4F3A521271
    for <xxx@xxx.de>; Fri, 26 May 2023 14:08:21 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=facebookmail.com;
    s=s1024-2013-q3; t=1685102883;
    bh=m1ZKqk2cr9uhQHr66HQnKWmqwM57hyI9HL9EmPnbf/I=;
    h=Date:To:Subject:From:MIME-Version:Content-Type;
    b=nqt5pKC97BtYwOGL30NiimYMDG0G8KT2fk+rouRavnBosulJnTnfZuBa+8CjNImED
     V0KGA6hcSfitfLF4ZYnhGXWfecJPXte2xfvgW08Gsv91Q01rpH6phop144Uxf5i93R
     f2QK/hPqecaTHESIFpg9MKQ73gDwFST04bZ9u5l8=
X-Facebook: from 2401:db00:5c:2214:face:0:398:0 ([MTI3LjAuMC4x])
    by www.facebook.com with HTTPS (ZuckMail);
Date: Fri, 26 May 2023 05:08:03 -0700
To: =?UTF-8?B?S2Fyc3RlbiBTcGllw58=?= <spiess@bitskin.de>
subject: SPAM: =?UTF-8?Q?=F0=9F=93=84=20?=xxxxxxxxhat ein Update gepostet
X-Priority: 3
X-Mailer: ZuckMail [version 1.00]
From: "Facebook" <friendupdates@facebookmail.com>
Reply-to: noreply <noreply@facebookmail.com>
Errors-To: friendupdates@facebookmail.com
X-Facebook-Notify: nf_status_story; mailid=U1U5fc974d17f97cG5af3608c0060G5fc9796adfc4eG313
List-Unsubscribe: <https://www.facebook.com/o.php?k=AS0IrBHTQOcaxx2LP7I&u=100001343340640&mid=5fc974d17f97cG5af3608c0060G5fc9796adfc4eG313&ee=AY2amC3zW69P2IQJPd6SMJSsPj66J4B_8CW7mtc7ac34ThivHGHGmw2aK3azS6NM1-rko9ryFiUMMbY>
BIMI-Selector: v=BIMI1; s=fb2023q1v2;
Feedback-ID: 6:nf_status_story:Facebook
X-FACEBOOK-PRIORITY: 1
X-Auto-Response-Suppress: All
Require-Recipient-Valid-Since: xxx@xxxxx.de; Tuesday,  6 Jul 2010 10:23:08 +0000
MIME-Version: 1.0
Content-Type: multipart/alternative;
    boundary="b1_6d93e70f8c1bdb733e7011b3c787eb81"
Message-ID: <f73eb390-fbbd-11ed-a237-2311304c8a54@facebookmail.com>
X-SPAM-LEVEL: Spam detection results:  3
    DKIM_ADSP_ALL             1.1 No valid author signature, domain signs all mail
    DKIM_INVALID              0.1 DKIM or DK signature exists, but is not valid
    DKIM_SIGNED               0.1 Message has a DKIM or DK signature, not necessarily valid
    ENV_AND_HDR_SPF_MATCH    -0.5 Env and Hdr From used in default SPF WL Match
    HTML_FONT_LOW_CONTRAST  0.001 HTML font color similar or identical to background
    HTML_MESSAGE            0.001 HTML included in message
    KAM_DMARC_STATUS         0.01 Test Rule for DKIM or SPF Failure with Strict Alignment
    KAM_FACEBOOKMAIL            8 Fake or Abused Facebook Mail
    KAM_REALLYHUGEIMGSRC      0.5 Spam with image tags with ridiculously huge http urls
    RCVD_IN_DNSWL_BLOCKED   0.001 ADMINISTRATOR NOTICE: The query to DNSWL was blocked.  See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information.
    RCVD_IN_SORBS_WEB         1.5 SORBS: sender is an abusable web server
    SPF_HELO_NONE           0.001 SPF: HELO does not publish an SPF Record
    SPF_PASS               -0.001 SPF: sender matches SPF record
    TVD_RCVD_IP             0.001 Message was received from an IP address
    T_SCC_BODY_TEXT_LINE    -0.01 -
    USER_IN_DEF_SPF_WL       -7.5 From: address is in the default SPF welcome-list
 
TheBit said:
Ich habe den Header eingefügt, für mich sieht das legitim aus. Die Mail ist nur 16KB Groß - sehen Sie hier einen Fehler?
Click to expand...
wie groß ist die max spam size?
 
ok - 256kb - da sollte die 16kb mail reinpassen

dennoch erkennt spamassassin die DKIM signature als invalid..
beim durchschauen sehe ich nur dass das subject ein 'SPAM:' vorne stehen hat - woher kommt das?

(wenn es durch das PMG rule-system kommt, sollte das keine rolle spielen, da die spamanalyse davor passiert - ansonsten würde das die ungültige Signatur erklären).

TheBit said:
subject: SPAM: =?UTF-8?Q?=F0=9F=93=84=20?=xxxxxxxxhat ein Update gepostet
Click to expand...
 
Vermutlich durch PMG - die Mail ist ja so im System vorhanden - Ich habe wieder eine Mail im Spamfilter:

Code: 
Delivered-To: xxx@xxx.de
Return-Path: friendupdates@facebookmail.com
Received-SPF: pass (facebookmail.com: 69.171.232.148 is authorized to use 'friendupdates@facebookmail.com' in 'mfrom' identity (mechanism 'ip4:69.171.232.0/24' matched)) receiver=xxx.xxx.de; identity=mailfrom; envelope-from="friendupdates@facebookmail.com"; helo=69-171-232-148.mail-mail.facebook.com; client-ip=69.171.232.148
Received: from 69-171-232-148.mail-mail.facebook.com (69-171-232-148.mail-mail.facebook.com [69.171.232.148])
    by xxx.xxx.de (Proxmox) with ESMTPS id 855ED215AE
    for <xxx@xxx.de>; Mon, 29 May 2023 12:56:59 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=facebookmail.com;
    s=s1024-2013-q3; t=1685357801;
    bh=jOyAOHbf0ueL5zp5tTnxKqii12ovZ/X+L33OOANmwRA=;
    h=Date:To:Subject:From:MIME-Version:Content-Type;
    b=YSyQpANk4iKeT3YyxpZ8XjIUHYp27B2RzOIcMU7VAKKbOa1ExUvLsNNoCQFIa9kgt
     s1QYLGQRfH1inPXYo+WYOcf5P+598EvNEaBYxPwRACc6EBdKmmOhQr6TkOzhpgzGt+
     0mz5oovNDSNdU9E/gUiBK62SN7OT2JOgT+Nw8Hko=
X-Facebook: from 2401:db00:111c:4501:face:0:3c0:0 ([MTI3LjAuMC4x])
    by www.facebook.com with HTTPS (ZuckMail);
Date: Mon, 29 May 2023 03:56:41 -0700
To: =?UTF-8?B?S2Fyc3RlbiBTcGllw58=?= <xxx@xxx.de>
subject: SPAM: =?UTF-8?Q?=F0=9F=94=97=20?=xxx xxx hat einen Link geteilt
X-Priority: 3
X-Mailer: ZuckMail [version 1.00]
From: "Facebook" <friendupdates@facebookmail.com>
Reply-to: noreply <noreply@facebookmail.com>
Errors-To: friendupdates@facebookmail.com
X-Facebook-Notify: nf_share_story; mailid=U1U5fcd2a763bc64G5af3608c0060G5fcd2f0f9bf36G318
List-Unsubscribe: <https://www.facebook.com/o.php?k=AS02jiakZOYGG7NP_nw&u=100001343340640&mid=5fcd2a763bc64G5af3608c0060G5fcd2f0f9bf36G318&ee=AY0Nc_mrUay_Fx8i2oxartdoRU6onhlCruP5umVGvC2cCc0VgQu9Fn8v-jnlsYXZtoOzOqd1KHxrGqM>
BIMI-Selector: v=BIMI1; s=fb2023q1v2;
Feedback-ID: 9:nf_share_story:Facebook
X-FACEBOOK-PRIORITY: 1
X-Auto-Response-Suppress: All
Require-Recipient-Valid-Since: xxx@xxx.de; Tuesday,  6 Jul 2010 10:23:08 +0000
MIME-Version: 1.0
Content-Type: multipart/alternative;
    boundary="b1_409b144b462fe5ec47238f3fa60ab4c6"
Message-ID: <7e0e577e-fe0f-11ed-84fc-23f919531530@facebookmail.com>
X-SPAM-LEVEL: Spam detection results:  4
    DKIM_ADSP_ALL             1.1 No valid author signature, domain signs all mail
    DKIM_INVALID              0.1 DKIM or DK signature exists, but is not valid
    DKIM_SIGNED               0.1 Message has a DKIM or DK signature, not necessarily valid
    DMARC_PASS               -0.1 DMARC pass policy
    HTML_FONT_LOW_CONTRAST  0.001 HTML font color similar or identical to background
    HTML_MESSAGE            0.001 HTML included in message
    KAM_DMARC_STATUS         0.01 Test Rule for DKIM or SPF Failure with Strict Alignment
    KAM_FACEBOOKMAIL            8 Fake or Abused Facebook Mail
    KAM_REALLYHUGEIMGSRC      0.5 Spam with image tags with ridiculously huge http urls
    RCVD_IN_MSPIKE_H3       0.001 Good reputation (+3)
    RCVD_IN_MSPIKE_WL       0.001 Mailspike good senders
    RCVD_IN_PSBL              2.7 Received via a relay in PSBL
    SPF_HELO_NONE           0.001 SPF: HELO does not publish an SPF Record
    SPF_PASS               -0.001 SPF: sender matches SPF record
    TVD_RCVD_IP             0.001 Message was received from an IP address
    T_SCC_BODY_TEXT_LINE    -0.01 -
    USER_IN_DEF_SPF_WL       -7.5 From: address is in the default SPF welcome-list



--b1_409b144b462fe5ec47238f3fa60ab4c6
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hallo Karsten,

=F0=9F=94=97 XXXX XXXX hat einen Link geteilt

Gr=C3=BC=C3=9Fe,
Das Facebook-Team

1685430603109.png
 
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