GSUITE DKIM not signing

[Diego Noya]

Hi All how are you ?

Im trying to set up a DKIM signature for one of our domain, I have generated the DKIM, I have upload it to the DNS also I have use several tools to test it, and its resolving fine, and DKIM is good.

G Suite is saying authenticating emails, but when I send an email from that Domain, I get a signature for a generic DKIM domain. XXXX.gappssmtp.com 

I have changed from 2048 to 1024, and same issue.

We have several domains in GSUITE as Aliases , and the rest are working , but this one is not.

Did anybody got this issue ?

Here more detailed information:

Received: from mail-vk1-f180.google.com (mail-vk1-f180.google.com [209.85.221.180])    by relay-10.us-west-2.relay-prod (Postfix) with ESMTPS id 14C1D25664    for <xxx@xxxx>; Fri, 6 May 2022 01:20:01 +0000 (UTC) Received: by mail-vk1-f180.google.com with SMTP id d132so2938600vke.0 for <x...@xxx.com>; Thu, 05 May 2022 18:20:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dopplerrelay-com.20210112.gappssmtp.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=oDCLTEWuwaXQN0UKTl9nH/h1B22S9HSJVDjLO/NCP2I=; b=ANWjCqF4H0cRHKuW00qKO4Oqpe/nQ1yFZLZT9vm6utQzVYC96LDmfY5zlLgZmF08a3 TprL1g9QiCQLrpFKbgrOyaNpTUFF3ZS/CcoSbvWw4aMMbm3M7/y489ABxeXo57w69Bhb YnyO0U5zJ42F8mGQgz+/or0jBo+12o2GI3iJ9fvoZbk4IgSw1TLHWZR2OSTMrouuvnZe WXeKJvDbI4iuuYqS1pYiaEzIGKnZL1Igyr7eN+zcI9n0SAnNfIqj2HmugVXBWxCxg3j1 uqNI8QZJnSWr8VMdK5cuyIpTjpwd/SHPmIG3w1J47hu3UCHw2jgq9i0yfzS/GNOVCYjj FHKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=oDCLTEWuwaXQN0UKTl9nH/h1B22S9HSJVDjLO/NCP2I=; b=PzSr4jGL5T4u7KoiLJsAFtmRExdwfKypnSoUCWHxYVlKGWpkxYYkV0ndyw87dZtVTJ LCjn1AnY12ueolM5jrUxKInt49u5pvtSBHznMk6oZ3Kc7kAC5E6c2qaTaoXlwF3AwD2p l0zvJBZ2cOGltypREdVh9+hgTbCy2X0fEZE1yAzUpvsiWPAZ3ks+XY6fWgkW52GVDzhD wP9+JBDb5Qw0fzljQ5ZpjA9ClH6dZ8QyRHm5flD/NeuFtCwb6Bah2Wo83tuCM2Jaj0kx QtBD14gv8RR+jjVv1/GeIWPimg8JXRDguOUVh6PSGYgEH6QLB2zqP2GnF+o9BFUgrNEi TewA== X-Gm-Message-State: AOAM531zbvKVJuNRmCCDpIGoS07ZvBhfKMfi9gTarOssQE6pGkrkeqQQ    +TDwME3IK3gEkVMo7YgXgQCvcQfWLjIwVlZIWREFjY7p48s= X-Google-Smtp-Source: ABdhPJzp5rcA8J3rSBOKLqT7BEZt1pf6CT6RvIx6usryVs2aFk6EWvgBk35HvFnCSWYxyfLFBlQkXQEBoPiUzaHeK20= X-Received: by 2002:a05:6122:882:b0:346:6c7b:c171 with SMTP id 2-20020a056122088200b003466c7bc171mr400116vkf.20.1651799999967; Thu, 05 May 2022 18:19:59 -0700 (PDT) MIME-Version: 1.0 From: Diego Noya <xxx@xxx> Date: Thu, 5 May 2022 22:19:44 -0300 Message-ID: <CALB3W6UKbst6kLmqKR-fPHoS...@mail.gmail.com> Subject: To: x...@xxx.com Content-Type: multipart/alternative; boundary="0000000000003d10be05de4da801" --0000000000003d10be05de4da801 Content-Type: text/plain; charset="UTF-8" --0000000000003d10be05de4da801 Content-Type: text/html; charset="UTF-8" <div dir="ltr"></div> --0000000000003d10be05de4da801--

[Ulises Casas Luna]

Hello,

If you don't set up DKIM, Gmail uses default DKIM(https://support.google.com/a/answer/180504).

DKIM signing increases email security and helps prevent email spoofing. We recommend you use your own DKIM key on all outgoing messages.

If you don't generate your own DKIM domain key, Gmail signs all outgoing messages with this default DKIM domain key: d=*.gappssmtp.com

Messages sent from servers outside of mail.google.com won't be signed with the default DKIM key.

I have provided a link to a guide, which will assist you in troubleshooting your DKIM issue.

https://support.google.com/a/answer/11612790?hl=en&ref_topic=2752442#

Regards.