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We're trying to set up DKIM authentication on our Google Apps/G Suite for Business domain to reduce the number of our emails which are ending up in people's spam folders. We have generated the DKIM key and set it up in Google Cloud DNS and have confirmed that it's set up using 3 different DKIM tools:

  1. Mail-checker
  2. MX Toolbox
  3. DKIM Core

All of them say it is valid, and yet when we try to Start Authenticating, it says "Email authentication was not verified. ..." We waited the suggested 48h (despite the DNS records being visible and correct 24h ago) and it still won't authenticate.

Screen shot of error when trying to start authentication

Any idea what else could be going wrong?

The domain is safedoorpm.com if you want to check the DNS yourself.

Edited to add email header 2016/10/21

Here is the header of a mail sent from our domain to gmail. Note that it is still using the default gappssmtp domain for DKIM, not ours:

Delivered-To: XXXX@gmail.com
Received: by 10.79.95.130 with SMTP id t124csp1047440ivb;
        Thu, 20 Oct 2016 14:30:12 -0700 (PDT)
X-Received: by 10.37.231.193 with SMTP id e184mr4430151ybh.13.1476999012850;
        Thu, 20 Oct 2016 14:30:12 -0700 (PDT)
Return-Path: <XXXX@safedoorpm.com>
Received: from mail-yw0-f176.google.com (mail-yw0-f176.google.com. [209.85.161.176])
        by mx.google.com with ESMTPS id v62si10092566ybg.141.2016.10.20.14.30.12
        for <XXXX@gmail.com>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Thu, 20 Oct 2016 14:30:12 -0700 (PDT)
Received-SPF: pass (google.com: domain of XXXX@safedoorpm.com designates 209.85.161.176 as permitted sender) client-ip=209.85.161.176;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@safedoorpm-com.20150623.gappssmtp.com;
       spf=pass (google.com: domain of XXXX@safedoorpm.com designates 209.85.161.176 as permitted sender) smtp.mailfrom=XXXX@safedoorpm.com
Received: by mail-yw0-f176.google.com with SMTP id u124so527ywg.3
        for <XXXX@gmail.com>; Thu, 20 Oct 2016 14:30:12 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=safedoorpm-com.20150623.gappssmtp.com; s=20150623;
        h=mime-version:from:date:message-id:subject:to;
        bh=rxgZTPk8FeVq2/dWzyjPIHnShPXlQzmPnvfbrUzW/Ss=;
        b=CJ6/IB1YNKvIsO0sUW8BvWyZZdjTQqBofzgOIbuW3Auo0sWtQB4cgWtzjzltr1SyZO
         b+eKJGSrdvRaaaLj7240nZwrVtrmTTlXcx2Qvm2yIp20ilDZWd4pJAAlvSC8wCxDQhYY
         1zwn9UcXxuwD2c05El/DSrdJy+mwVlNv4w3D2v+hPSO0CKS7rKYsjFLEJcQrlAjjANnJ
         itn3oz6DxasplOSmSX8tIOXSHFNnYaJM5lbUtm9cLOWvffclmeShcTbhu/BWWdg1pFHn
         6dXvj6tX7KvbPr9GzH6LnVd71IHe/R65/2VQdqdT0uvJn5KWkc0ziHRlm3HV8JiWXGZf
         oyRQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20130820;
        h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
        bh=rxgZTPk8FeVq2/dWzyjPIHnShPXlQzmPnvfbrUzW/Ss=;
        b=IcWYvLXbpDB2CCV40fWymGcvbICsjuJipBhW5d1d9WFAM4jVDsZd+2K5ENwvVM4L20
         DDbYoqPIoNBwFIaqIB3Sx30xVgFb7d4k7SVSfRZJctrY6QQyO/k6KaxL6++AAxHPbcNw
         jls+G5kzs+62OGQzq6w2Z9VNp6CSEyKqqORsAAjEdwa89v8VLLwyRdUoDxZvpiLAFZ8K
         riyjP7ebj5iyKJsuviX24kQ6QEJZh6RAAhILudAw8+vtNM3Ml+UUHOlAqbPPgseUB4qx
         9hSv+9uQA8w2v7sDiNVVCOoJa20bXZTsLmqlJB6yC4Bt2kzIeSpg5GcALx8EfuaGBiCu
         qo+w==
X-Gm-Message-State: AA6/9RmpTg+BzD0kFfXdFBfUIsAcwb0VxlByb8FBWzHYz/gJotrTZ42AzZtIqsANt5a7rf/hu9In1wdErNHioA==
X-Received: by 10.202.53.68 with SMTP id c65mr8679383oia.57.1476999012386; Thu, 20 Oct 2016 14:30:12 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.202.207.5 with HTTP; Thu, 20 Oct 2016 14:29:31 -0700 (PDT)
From: Mike Totman <XXXX@safedoorpm.com>
Date: Thu, 20 Oct 2016 15:29:31 -0600
Message-ID: <CAGsv74XyfTOqi7eJ4cCD90Dx8VPvFB1NFLujtCvKgDaCOCT0vQ@mail.gmail.com>
Subject: DKIM test 10
To: Mike Totman <XXXX@gmail.com>
Content-Type: multipart/alternative; boundary=001a113d4f2877afad053f52a17e

Edited to add output from DKIMValidator.com 2016/10/21

I also tried sending an email to the DKIMValidator.com tool, and this is the result. Note that it is still using the default gappssmtp domain for DKIM, not ours:

DKIM Information:

DKIM Signature


Message contains this DKIM Signature:
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=safedoorpm-com.20150623.gappssmtp.com; s=20150623;
        h=mime-version:from:date:message-id:subject:to;
        bh=5wQSTkgMlB+S2PAmekAxIh7O+zBt2H5aC2Ft8cNRJWQ=;
        b=ItJ0UFj97i19qHEFF9ACB5sQY50iZv9ZJ2J9l4JIgSKkSbd/QOi0OGsRWtMe9p5yU4
         vp6z1mgah8DBa+fgCEtTqrOyd+LjaXm0f6FJXyJiV+E7FcdpJ1bSEHyzRlulR0TLqJ/E
         LK0JDXSFNCSUTrWVsrGxIKo7HscI+jY5CR/nTf9cRvTj9Z22lFeukAvVpuhSz88XQeBX
         2TXk2I+p21+L0xAbv0x4OCDgWM5W4WRJUqGi0+gu/IhQBomi/e7wEYZ2f+lvNKRpRggU
         QD2dv15fCibJ3jufVBglpCx9En94UlPuiZqaCi0qqriLnhV/76iBMajI+WyelCG2SimU
         Ht6g==


Signature Information:
v= Version:         1
a= Algorithm:       rsa-sha256
c= Method:          relaxed/relaxed
d= Domain:          safedoorpm-com.20150623.gappssmtp.com
s= Selector:        20150623
q= Protocol:        
bh=                 5wQSTkgMlB+S2PAmekAxIh7O+zBt2H5aC2Ft8cNRJWQ=
h= Signed Headers:  mime-version:from:date:message-id:subject:to
b= Data:            ItJ0UFj97i19qHEFF9ACB5sQY50iZv9ZJ2J9l4JIgSKkSbd/QOi0OGsRWtMe9p5yU4
         vp6z1mgah8DBa+fgCEtTqrOyd+LjaXm0f6FJXyJiV+E7FcdpJ1bSEHyzRlulR0TLqJ/E
         LK0JDXSFNCSUTrWVsrGxIKo7HscI+jY5CR/nTf9cRvTj9Z22lFeukAvVpuhSz88XQeBX
         2TXk2I+p21+L0xAbv0x4OCDgWM5W4WRJUqGi0+gu/IhQBomi/e7wEYZ2f+lvNKRpRggU
         QD2dv15fCibJ3jufVBglpCx9En94UlPuiZqaCi0qqriLnhV/76iBMajI+WyelCG2SimU
         Ht6g==
Public Key DNS Lookup


Building DNS Query for 20150623._domainkey.safedoorpm-com.20150623.gappssmtp.com
Retrieved this publickey from DNS: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2UMfREvlgajdSp3jv1tJ9nLpi/mRYnGyKC3inEQ9a7zqUjLq/yXukgpXs9AEHlvBvioxlgAVCPQQsuc1xp9+KXQGgJ8jTsn5OtKm8u+YBCt6OfvpeCpvt0l9JXMMHBNYV4c0XiPE5RHX2ltI0Av20CfEy+vMecpFtVDg4rMngjLws/ro6qT63S20A4zyVs/V19WW5F2Lulgv+l+EJzz9XummIJHOlU5n5ChcWU3Rw5RVGTtNjTZnFUaNXly3fW0ahKcG5Qc3e0Rhztp57JJQTl3OmHiMR5cHsCnrl1VnBi3kaOoQBYsSuBm+KRhMIw/X9wkLY67VLdkrwlX3xxsp6wIDAQAB
Validating Signature


result = pass
Details: 

  • Can you post the relevant header authentication results from an email sent to another domain, such as some Gmail account? – Paul Oct 21 '16 at 14:56
  • The DKIM header is passing Google's DKIM checks, so there doesn't seem to be a problem. What service are you using that tells you the DKIM checks are failing? – Paul Oct 21 '16 at 15:53
  • We are unable to turn on the email authentication, so the email checks are actually using Google's default DKIM for 'gappssmtp', not our configured DKIM key. I forgot about that when I added the mail headers. – Bdoserror Oct 21 '16 at 16:15
  • Which step in the Google DKIM support article are you stuck on? – Paul Oct 21 '16 at 16:21
  • 1
    @George There is nothing wrong with the record. You can inspect it yourself at google._domainkey.safedoorpm.com – Paul Oct 21 '16 at 20:17
2

After finally talking to Google support I ended up trying a 1024 bit DKIM key instead of a 2048 bit key. That worked.

One thing I noticed is that the DNS record for the 1024 bit key was all one string, whereas I had to break up the 2048 bit key into several strings in the same record. My theory is that Google Admin console doesn't recognize that properly, since the other tools I used (links in the question) validated it OK.

0

KIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=safedoorpm-com.20150623.gappssmtp.com; s=20150623;

Please note that in "d=" tag there is safedoorpm-com.20150623.gappssmtp.com

I had the same problem and after changing the DKIM signature to 1024 now in all emails in the d tag is the domain not subdomain in gappssmtp.com.

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