We use Mailgun to send emails, and I recently noticed that a large number of emails are rejected per day by Gmail.
Here is the type of message we receive:
550
5.7.1 [184.173.153.6 11] Our system has detected that this message is
5.7.1 not RFC 2822 compliant. To reduce the amount of spam sent to Gmail,
5.7.1 this message has been blocked. Please review
5.7.1 RFC 2822 specifications for more information. f15si23385851vdu.1 - gsmtp
RFC 2822 spec is a massive document, so I didn’t read it in front of me, and I looked at resources on the Internet, our letters do not fall into any of the common errors that could cause this type of response from Gmail.
Here is an example email header:
Received: by luna.mailgun.net with HTTP; Mon, 29 Jun 2015 21:06:59 +0000
Message-Id: <20150629210659.18668.39318@(domain)>
X-Mailgun-Variables: {"variation": "original", "campaign_code":
"(customValue)"}
Reply-To: (name) <(email)>
X-Mailgun-Track: false
X-Mailgun-Tag: (customTag)
To: (email)
From: (name) <(email)>
Subject: (subject)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="12f0bd630f2145a3afcd98b621a3b1f2"
--12f0bd630f2145a3afcd98b621a3b1f2
Content-Type: text/plain; charset="ascii"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
(text content)
--12f0bd630f2145a3afcd98b621a3b1f2
Content-Type: text/html; charset="ascii"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>(title)</title>
<style type="text/css">
(css)
</style>
</head><body style="(css)" >
(content)
</body>
</html>
--12f0bd630f2145a3afcd98b621a3b1f2--
What are we doing wrong?
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