GMail sends basic email to spam folder. SPF DKIM ok?

Question

I am trying to send an email from my server using Mailgun. It's a very basic plain text email but for some reason it is ending up in spam. SPF and DKIM passes. Any ideas? I don't have any clue. This is going to be for transactional email.. not spam/newsletter etc.

Received-SPF: pass (google.com: domain of bounce+42008d.8253-tuni=gmail.com@solopaquetes.com designates 184.173.153.208 as permitted sender) client-ip=184.173.153.208;
DomainKey-Signature: a=rsa-sha1; c=nofws; d=mailgun.org; s=mg; q=dns;
 h=X-Feedback-Id: Mime-Version: Content-Type: Subject: From: To:
 Message-Id: Content-Transfer-Encoding: Date: Sender;
 b=GkRBlyzsmYFxIls71vtIRC3/bbjBTX8lsFszV8kYzI/WPoJ/mV4dFFW4wS/5jQJvrPcn7G
 n70QGPrKzRCXxrI9XLYR0YMRfHAl+1rvpF1iEy94dJs3eQnplzYW0VEweichjuveYFvQm0n5
 q9qVRkkICdC1ZdupGlCuHxKM+O1oc=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=solopaquetes.com; s=pic;
 q=dns; h=Mime-Version: Content-Type: Subject: From: To: Message-Id:
 Content-Transfer-Encoding: Date: Sender;
 b=Szpfx57WdEy5XOUERaOhm7GBDTj3grOTay209h1bl8C5Y81bC3hsLxgthR7iIO7wjh5zNh
 /ywVgPcqeDzJqGFx5vKylOcEIDIbsgybdBjQNMF1E5BOgDN6jwA3oadRgMrF6YxiTpUMoSfE
 kk5dIl++NG/Y/ItJ+388om1UTkcWs=
Mime-Version: 1.0
Content-Type: text/plain; charset="ascii"
Subject: Bienvenido a Solopaquetes.com, activa tu cuenta!
From: SoloPaquetes.com <fer@solopaquetes.com>
To: tuni@gmail.com
Message-Id: <20140510224445.20658.66762@solopaquetes.com>
Content-Transfer-Encoding: 7bit
Date: Sat, 10 May 2014 22:44:47 +0000
Sender: fer@solopaquetes.com

Testing some Mailgun awesomness!

Any clues will help. I don't have much experience with this. Thanks in advance.

possible duplicate of [How to send emails and avoid them being classified as spam](http://serverfault.com/questions/48428/how-to-send-emails-and-avoid-them-being-classified-as-spam) — Cristian Ciupitu, May 10 '14 at 23:53
See also http://serverfault.com/questions/563046/emails-going-to-gmails-spam-dkim-and-spf-are-both-set-up-correctly — Cristian Ciupitu, May 10 '14 at 23:54

score 2 · Accepted Answer · answered May 10 '14 at 23:10

While DKIM and SPF are useful in identifying yourself as a sender for that domain, spammers can use them too, so they don't guarantee delivery.

Different destinations weight different aspects of the email message differently, but here are the major points, ranked roughly from most important to least:

Content of the email. Gmail appears to rely on this more than others.
Delivery attempt rate (especially as comparison to the moving average from the IP)
Reputation of the sending server/IP
DNS mechanics (SPF, DKIM, PTR Records, A records, MX records, etc.)
Reputation of the sending domain
Message formatting, including header abnormalities

The first thing I'd do is test with the real content of the email you intend to send out, not "this is a test." And if it doesn't work, complain to whomever is sending your mail out (mailgun in this instance).

Hi Tyler, thanks for your answer. I have actually tested with the real content and was being delivered most of the time to the spam folder. That's why I started testing with very basic, non-html emails to see if the problem was the content or something else. But any content ends up in the spam folder so it must be something else. Do you know how to check if the PTR record is set up correctly looking at that email? — Agustin Lopez, May 10 '14 at 23:43

GMail sends basic email to spam folder. SPF DKIM ok?

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