Help Analyzing Email Header

By primexx
in Smart Home, Network & Security

 Share

Recommended Posts

Grand Master

primexx

Posted
Posted

I've recently been getting a perculiar kind of spam, I'm having a little trouble figuring out why it's avoiding the spam filter.

My email setup: I'm using google apps. I have records for SPF (the generic google one), DKIM (unique), and DMARC. My DMARC policy is using default values (but p=quarantine), which uses relaxed alignment mode for both SPF and DKIM as well as letting mail through if either passes (to avoid f/p of forwarding servers).

Basically, this new spam claims to come from my own domain, which it obviously isn't. Now usually this wouldn't be a problem since it should fail both SPF and DKIM. But it looks like this breed is passing (or at least not failing) SPF for some reason. I'm referring specifically to "Received-SPF" and "Authentication-Results", which makes it look like they're using a Gmail account to originate the spam, but the Gmail account itself obviously can't spoof email addresses on my domain. Later down it appears that they are, in fact, using a third party sender, but how does it pass SPF?

I'm quite confused about this header, could anyone with more experience in this area shed some light as to what's actually happening? Is there any change I can make to the DMARC policy to filter this out?

Thanks!


Delivered-To: [email protected]
Received: by 10.223.161.66 with SMTP id q2csp29576fax;
		Sat, 16 Feb 2013 13:11:56 -0800 (PST)
X-Received: by 10.220.116.5 with SMTP id k5mr9087041vcq.55.1361049116195;
		Sat, 16 Feb 2013 13:11:56 -0800 (PST)
Return-Path: <[email protected]>
Received: from 201-212-133-238.cab.prima.net.ar (201-212-133-238.cab.prima.net.ar. [201.212.133.238])
		by mx.google.com with ESMTP id a1si13647855vdk.21.2013.02.16.13.11.54;
		Sat, 16 Feb 2013 13:11:56 -0800 (PST)
Received-SPF: neutral (google.com: 201.212.133.238 is neither permitted nor denied by domain of [email protected]) client-ip=201.212.133.238;
Authentication-Results: mx.google.com;
	   spf=neutral (google.com: 201.212.133.238 is neither permitted nor denied by domain of [email protected]) [email protected]
Message-ID: <[email protected]>
Date: Sat, 16 Feb 2013 18:25:48 -0300
From: <[email protected]>,
<[email protected]>,
<[email protected]>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6
MIME-Version: 1.0
To: <[email protected]>,
<[email protected]>,
<[email protected]>
Subject: Take a spare three-hour work week in our clinic and get 580 dollars.
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
[/CODE]

Link to comment
https://www.neowin.net/forum/topic/1136888-help-analyzing-email-header/
Share on other sites
Grand Master

TAZMINATOR

Posted
Posted

It might be this address:


[email protected]  and/or
[email protected]
[/CODE]

Which you got this today or yesterday... then next email you will get same address with random numbers such as 145, 160, 134... which is why you still get spam in your inbox. If you want to block them... block them with any words you might find in the body or subject line... such as viagra, so you can add them to your blacklist.

Grand Master

+BudMan MVC

Posted
  • MVC
Posted

gmail spf is not very locked down, if you check that IP against it - if you check any IP against it comes up as neutral

201.212.133.238 may send in the name of the domain.

  • SPF check start.
    • Domain: gmail.com

    [*]Getting SPF (TXT) record.

    [*]Found SPF record.

    [*]SPF policy record data:

    • v=spf1 redirect=_spf.google.com

    [*]Evaluating SPF policy:

    • v=spf1 redirect=_spf.google.com

    [*]Policy parsed OK, no warnings.

    [*]Evaluating SPF policy string.

    • Following the "redirect" modifier.
      • Argument domain-spec: _spf.google.com

      • Domain argument after macro expansion:
        • _spf.google.com

      • SPF check start.
        • Domain: _spf.google.com

      • Getting SPF (TXT) record.

      • Found SPF record.

      • SPF policy record data:
        • v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ?all

      • Evaluating SPF policy:
        • v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ?all

      • Policy parsed OK, no warnings.

      • Evaluating SPF policy string.
        • Evaluating SPF mechanism "include".
          • Prefix: Pass.

          • Argument domain-spec: _netblocks.google.com

          • Domain argument after macro expansion:
            • _netblocks.google.com

          • SPF check start.
            • Domain: _netblocks.google.com

          • Getting SPF (TXT) record.

          • Found SPF record.

          • SPF policy record data:
            • v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all

          • Evaluating SPF policy:
            • v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all

          • Policy parsed OK, no warnings.

          • Evaluating SPF policy string.
            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 216.239.32.0

              • Argument ip4-cidr-length: 19

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 64.233.160.0

              • Argument ip4-cidr-length: 19

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 66.249.80.0

              • Argument ip4-cidr-length: 20

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 72.14.192.0

              • Argument ip4-cidr-length: 18

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 209.85.128.0

              • Argument ip4-cidr-length: 17

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 66.102.0.0

              • Argument ip4-cidr-length: 20

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 74.125.0.0

              • Argument ip4-cidr-length: 16

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 64.18.0.0

              • Argument ip4-cidr-length: 20

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 207.126.144.0

              • Argument ip4-cidr-length: 20

            • Evaluating SPF mechanism "ip4".
              • Prefix: Pass.

              • Argument network-spec: 173.194.0.0

              • Argument ip4-cidr-length: 16

            • Evaluating SPF mechanism "all".
              • Prefix: Neutral.

            • SPF mechanism "all" matched with prefix Neutral.

          • Finished evaluating SPF policy.

          • SPF policy evaluation finished with SPF Neutral.

        • Evaluating SPF mechanism "include".
          • Prefix: Pass.

          • Argument domain-spec: _netblocks2.google.com

          • Domain argument after macro expansion:
            • _netblocks2.google.com

          • SPF check start.
            • Domain: _netblocks2.google.com

          • Getting SPF (TXT) record.

          • Found SPF record.

          • SPF policy record data:
            • v=spf1 ip6:2001:4860:4000::/36 ip6:2404:6800:4000::/36 ip6:2607:f8b0:4000::/36 ip6:2800:3f0:4000::/36 ip6:2a00:1450:4000::/36 ip6:2c0f:fb50:4000::/36 ?all

          • Evaluating SPF policy:
            • v=spf1 ip6:2001:4860:4000::/36 ip6:2404:6800:4000::/36 ip6:2607:f8b0:4000::/36 ip6:2800:3f0:4000::/36 ip6:2a00:1450:4000::/36 ip6:2c0f:fb50:4000::/36 ?all

          • Policy parsed OK, no warnings.

          • Evaluating SPF policy string.
            • IP6 mechanism evaluation is not implemented.

            • IP6 mechanism evaluation is not implemented.

            • IP6 mechanism evaluation is not implemented.

            • IP6 mechanism evaluation is not implemented.

            • IP6 mechanism evaluation is not implemented.

            • IP6 mechanism evaluation is not implemented.

            • Evaluating SPF mechanism "all".
              • Prefix: Neutral.

            • SPF mechanism "all" matched with prefix Neutral.

          • Finished evaluating SPF policy.

          • SPF policy evaluation finished with SPF Neutral.

        • Evaluating SPF mechanism "include".
          • Prefix: Pass.

          • Argument domain-spec: _netblocks3.google.com

          • Domain argument after macro expansion:
            • _netblocks3.google.com

          • SPF check start.
            • Domain: _netblocks3.google.com

          • Getting SPF (TXT) record.

          • Found SPF record.

          • SPF policy record data:
            • v=spf1 ?all

          • Evaluating SPF policy:
            • v=spf1 ?all

          • Policy parsed OK, no warnings.

          • Evaluating SPF policy string.
            • Evaluating SPF mechanism "all".
              • Prefix: Neutral.

            • SPF mechanism "all" matched with prefix Neutral.

          • Finished evaluating SPF policy.

          • SPF policy evaluation finished with SPF Neutral.

        • Evaluating SPF mechanism "all".
          • Prefix: Neutral.

        • SPF mechanism "all" matched with prefix Neutral.

      • Finished evaluating SPF policy.

      • SPF policy evaluation finished with SPF Neutral.

    • Returned from redirection.

    [*]Finished evaluating SPF policy.

    [*]SPF policy evaluation finished with SPF Neutral.

So did a test with just random ****.. 1.2.3.4 may send in the name of the domain.

http://vamsoft.com/s...f-policy-tester

You can use this is well http://www.kitterman...f/validate.html, you can pretty much test anything with a gmail.com domain and you get neutral..

if you notice their record

v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ?all

So since using ?, they never fail anything - so what is the point of the policy?? ;) They really should have a - for their policy.

Each mechanism can be combined with one of four qualifiers:

  • + for a PASS result. This can be omitted; e.g., +mx is the same as mx.
  • ? for a NEUTRAL result interpreted like NONE (no policy).
  • ~ (tilde) for SOFTFAIL, a debugging aid between NEUTRAL and FAIL. Typically, messages that return a SOFTFAIL are accepted but tagged.
  • - (minus) for FAIL, the mail should be rejected (see below).

Grand Master

+BudMan MVC

Posted
  • MVC
Posted

your hopeless using spf to filter on - its going to be neutral.. But sure there is something else you could filter on.. is the spam all coming from that IP? Got to be some key words to block.. Can you just report as spam, normally gmail updates their filtering.

This topic is now closed to further replies.
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Posts

    • qBittorrent 5.2.2

      By Copernic · Posted

      qBittorrent 5.2.2 by Razvan Serea The qBittorrent project aims to provide a Free Software alternative to µtorrent. qBittorrent is an advanced and multi-platform BitTorrent client with a nice user interface as well as a Web UI for remote control and an integrated search engine. qBittorrent aims to meet the needs of most users while using as little CPU and memory as possible. qBittorrent is a truly Open Source project, and as such, anyone can and should contribute to it. qBittorrent features: Polished µTorrent-like User Interface Well-integrated and extensible Search Engine Simultaneous search in most famous BitTorrent search sites Per-category-specific search requests (e.g. Books, Music, Movies) All Bittorrent extensions DHT, Peer Exchange, Full encryption, Magnet/BitComet URIs, ... Remote control through a Web user interface Nearly identical to the regular UI, all in Ajax Advanced control over trackers, peers and torrents Torrents queueing and prioritizing Torrent content selection and prioritizing UPnP / NAT-PMP port forwarding support Available in ~25 languages (Unicode support) Torrent creation tool Advanced RSS support with download filters (inc. regex) Bandwidth scheduler IP Filtering (eMule and PeerGuardian compatible) IPv6 compliant Available on most platforms: Linux, Mac OS X, Windows, OS/2, FreeBSD qBittorrent 5.2.2 changelog: FEATURE: Use D-Bus to show file in file managers (Chocobo1) #24340 BUGFIX: Fix friendlyUnitCompact precision calculation (vafada) #24323 BUGFIX: Remove all top-level folders (glassez) #24333 BUGFIX: Use proper API for checking exit status (Chocobo1) #24349 BUGFIX: Delete stale lockfile when hostname mismatch (TurboTheTurtle, glassez) #24363 BUGFIX: Fix wrong removal procedure of watched folder paths (Chocobo1) #24413 BUGFIX: Don't reannounce before interface changes are applied (glassez) #24447 BUGFIX: Use Latin script for Bosnian locale name (Andy Ye) #24342 WEBUI: Fix performance of global checkbox toggling (tehcneko) #24316 WEBUI: Fix Safari transfer list header misalignment (Piccirello) #24377 WEBUI: Fix error when submitting magnet before metadata loads (Piccirello) #24378 WEBUI: Use correct row id when updating Rss Downloader feed selection (Chocobo1) #24402 WEBUI: Use SameSite=Lax for session cookie to fix cross-site login (Piccirello) #24422 WEBUI: Bring back properties panel expand/collapse button (vafada) #24430 WEBAPI: Only use X-Forwarded-Host header when reverse proxy support is enabled (Chocobo1) #24457 RSSS: Fix "RSS Smart Episode Filter" RegEx (nathanon-akk, glassez) #24398 RSS: Fix previously matched episode format (glassez) #24452 WINDOWS: Fix Python fallback search path (TurboTheTurtle) #24325 WINDOWS: NSIS: Allow to install x64 binary on ARM64 (Chocobo1) #24358 Download: qBittorrent 5.2.2 | 41.1 MB (Open Source) Download: qBittorrent 64-bit installer (qt6) | 43.6 MB Links: qBittorrent Home page | Screenshot Get alerted to all of our Software updates on Twitter at @NeowinSoftware
    • Microsoft faces shareholder lawsuit over masking AI costs and slowing Azure growth

      By +Tantawi · Posted

      Microslop.
    • what other retro software do yall use

      By binaryzero · Posted

      Weechat. https://weechat.org/
    • Major Xbox layoffs may claim South of Midnight developer Compulsion entirely

      By nekrosoft13 · Posted

      they should stop making bad games that no one asked for
    • Samsung is shutting down yet another app used by millions

      By +Edouard · Posted

      Nice rant! Expletive after expletive after expletive. Poor petal, I've touched a nerve. Would you like a tissue to wipe those tears away. Btw, nice one calling Neowin trash. Why would you stick around when you disrespect this site and the people behind it? Just go away if you feel that way.

  • Recent Achievements

    • Veteran
      branfont went up a rank
      Veteran
    • Reacting Well
      Almohandis earned a badge
      Reacting Well
    • First Post
      Cosminus earned a badge
      First Post
    • One Year In
      ThatGuyOnline earned a badge
      One Year In
    • Week One Done
      Jeroen Wilms earned a badge
      Week One Done

  • Popular Contributors

    1. 1
      +primortal
      483
    2. 2
      +Edouard
      183
    3. 3
      PsYcHoKiLLa
      123
    4. 4
      Steven P.
      87
    5. 5
      neufuse
      72
    Show More

  • Tell a friend

    Love Neowin? Tell a friend!