There have been various recent reports of disappearing messages that turned out to have been miscategorized as spam by gmail. I continue to see openjdk messages in my spam folder from non-spammers at Google and elsewhere.

A dump of information follows from some local investigation at Google:

spam analyst:

The issue is the list configuration, they modify the email body which breaks the DKIM signature, which results in the message no longer being authenticated.

Authentication-Results: mx.google.com;
       dkim=fail header.i=@google.com header.s=20161025 header.b=v3HuYX4A;
       spf=neutral (google.com: 141.146.126.229 is neither permitted nor denied by best guess record for domain of compiler-dev-bounces@openjdk.java.net) smtp.mailfrom=compiler-dev-bounces@openjdk.java.net;
       dmarc=fail (p=REJECT sp=REJECT dis=QUARANTINE) header.from=google.com

For the domain "google.com", we've set a DMARC reject policy. This means that we tell all email services (including ourselves) that for email to say it comes from google.com, it has to either come directly or not be modified. This email purports to be from ronshapiro@google.com, but it doesn't come directly from Google, and the content has been modified. So we can't confirm that it truly came from Google without modification, and as such we end up spam foldering the message. We don't actually reject the message here even though we're supposed to according to the DMARC policy, because we can tell that it was likely forwarded, so we take the gentler step of accepting it and spam foldering it.

This is an unfortunate case where DMARC doesn't work very well.

How can they fix this? They can pursue any of:
a) Not modifying the message so the DKIM signature won't break
b) Using the ARC standard, which Googlers have developed for exactly this type of problem, though for some reason even the ARC header is broken in this case. Perhaps multiple hops, or a misconfiguration.
c) Having the mailing list re-write the From header when they modify messages


me:

Is this the exact problem discussed here:
https://wiki.list.org/DEV/DMARC

Is there a google-blessed way to continue to run a mailman mailing list? E.g. "you should upgrade to Mailman 3"

I see the header
X-Mailman-Version: 2.1.17
but https://wiki.list.org/DEV/DMARC refers to features added in Mailman 2.1.18
so maybe "upgrade to 2.1.18"?


spam analyst:

I'm not aware of any officially Google-sanctioned way to run a mailing list; plus the issues in this case aren't Google-specific: the mailing list will have the same issues with any email service provider that enforces DMARC. The closest thing we have are forwarding best practices, which can be found here: https://support.google.com/mail/answer/175365?hl=en

As to Mailman, I'm not familiar with it, but the link you shared is a pretty good one with regards to dealing with DMARC from mailing lists. The suggestions in the Mailman 3 section would fix the issue.


mail headers from message referenced above:


Delivered-To: martinrb@google.com
Received: by 2002:a25:c791:0:0:0:0:0 with SMTP id w139-v6csp35860ybe;
        Wed, 3 Oct 2018 04:21:59 -0700 (PDT)
X-Google-Smtp-Source: ACcGV616UmG2NafO4Z7S5WeZ03NTOQNkF6dLCxPh5XIHUH1UPuqKz3Y4/S7D3sI2cmzwsKslRksP
X-Received: by 2002:a63:9d01:: with SMTP id i1-v6mr922759pgd.98.1538565718960;
        Wed, 03 Oct 2018 04:21:58 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1538565718; cv=none;
        d=google.com; s=arc-20160816;
        b=0XMlm35jtMStgbCmGPnnELDdBOizEhLR4zyRojBGsd9g7TeFjYDIpIrA99fxGNT5h8
         lh4tBe4/qCw0vzkRvxpQ6AraNGBOEH5dGjCJeKGETr8r877oUljYQWq1ZthMY8V2A/Nf
         kZY3a1sPZHPG0OtJJAgCIslI1mBKtCFuM0A786EjZZA3eiytQbwbI/dHbPNBhfZ4a72U
         fdR7iQGdTUN7gXFIxCBqSsDWqy6KiyF5uZnkPfnNbmqfAz/zest+DZDsW2VW6l/h2INW
         eTIvNgDeAS+jCUlqmsL0gmhU6ZFzq40OjoGB5FEOzbbKNSXQIy59gtec83pItuwdi7Wp
         qVTw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=sender:errors-to:list-subscribe:list-help:list-post:list-archive
         :list-unsubscribe:list-id:precedence:to:subject:message-id:date:from
         :mime-version:dkim-signature:delivered-to;
        bh=X01jHIYgqHE9R0MHnbgV5r3ICMISwUt97OJfQofiTig=;
        b=yGl5Q8aLC09dwQv/DiPTNAjNxuJy7wIb40iKrdTguXdUmBIORqoBs0YFFSANWuiuqf
         0lZ+Kk28Rtsb/GmilQJFaTmhICRYaoqKvNoudRaN6vYhF22zUVlux84T1L9LXxIIW5Sx
         rhiD500qpR0JvlvvaJL6ZQehpfXZCeYxw4fCvtfp8pM5qOii63nD4XjFgoYEUQQNsKXO
         lu8zRbU8BJDvfTn+7jqSEnATLHawDBlT1HLUymvBt9S3DbiJGlUHCPTJAsgFogEVCpys
         iB7AtpIim8+jqdrlUIJ7aOi04ppDzp4oJWYGXY5cz5M12AnZrpxWMtvGyTf1BTrX9iFD
         dkPw==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=fail header.i=@google.com header.s=20161025 header.b=v3HuYX4A;
       spf=neutral (google.com: 141.146.126.229 is neither permitted nor denied by best guess record for domain of compiler-dev-bounces@openjdk.java.net) smtp.mailfrom=compiler-dev-bounces@openjdk.java.net;
       dmarc=fail (p=REJECT sp=REJECT dis=QUARANTINE) header.from=google.com
Return-Path: <compiler-dev-bounces@openjdk.java.net>
Received: from acsinet41.oracle.com (acsinet41.oracle.com. [141.146.126.229])
        by mx.google.com with ESMTPS id f9-v6si1158678pgh.325.2018.10.03.04.21.27
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Wed, 03 Oct 2018 04:21:58 -0700 (PDT)
Received-SPF: neutral (google.com: 141.146.126.229 is neither permitted nor denied by best guess record for domain of compiler-dev-bounces@openjdk.java.net) client-ip=141.146.126.229;
Authentication-Results: mx.google.com;
       dkim=fail header.i=@google.com header.s=20161025 header.b=v3HuYX4A;
       spf=neutral (google.com: 141.146.126.229 is neither permitted nor denied by best guess record for domain of compiler-dev-bounces@openjdk.java.net) smtp.mailfrom=compiler-dev-bounces@openjdk.java.net;
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  Wed, 03 Oct 2018 04:21:01 -0700 (PDT)
MIME-Version: 1.0
From: Ron Shapiro <ronshapiro@google.com>
Date: Wed, 3 Oct 2018 14:20:48 +0300
Message-ID: <CACA6h9to7szM0dSpOjUhLWFWTUEHCvRNFhS_x+TgeesS6qYC_w@mail.gmail.com>
Subject: Name.contentEquals() performance
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