Does Gmail mark mail as spam?

Question

Google

This question has already been asked , but I can't find a solution for my case. The server is configured according to all recommendations, headers:
Received-SPF: pass (google.com: domain of [email protected] designates 1.2.3.4 as permitted sender) client-ip=1.2.3.4;
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of [email protected] designates 1.2.3.4 as permitted sender) [email protected];
dkim=pass [email protected]
The domain specified in mx and spf has correct reverse dns, everything is sent from it.
The content is quite simple, but the problem is probably somewhere in it, although on other projects everything exactly the same does not cause problems with falling into spam
Date: Fri, 05 Apr 2013 13:31:29 +0200
From: [email protected]
Reply-To: [email protected]
To: xxx
Subject: Confirmation instructions
Mime-Version: 1.0
Content-Type: text/html;
charset=UTF-8
Content-Transfer-Encoding: 7bit
<p>Welcome xxx!</p>
<p>You can confirm your account email through the link below:</p>
<p><a href=" mydomain. co/users/confirmation?confirmation_token=xxx ">Confirm my account</a></p>
Where else to dig?

Answer 1

.co zone, email in HTML, link in email, looks very much like spam

Answer 2

server, your ip? Maybe spam comes from it without your knowledge? Check the logs, the queue of letters, what the mailers say in response.

Answer 3

spamcop and spamhaus are clean.

Answer 4

Check mxtoolbox.com/blacklists.aspx

Answer 5

Most likely the answer is in the first comment.

Answer 6

Google has its own vibe. They themselves sometimes do not understand why their system filters out certain letters. “Too independent,” say the guys from Google. Sometimes you manage to get yourself out of SPAM if you write to them in support on this topic.