The company I work for sends a marketing email at least one time per week using Mailchimp's email service.  All of our subscribers are opt-in active customers and our emails are not spammy.  There is an above average text to image ratio, and copy does not contain 'spammy' words.

However, we've recently started noticing that our emails are being filters to spam significantly more often.

[According to Mailchimp][1], by using their internal authentication our campaigns will pass SenderID, SPF, DomainKeys, and DKIM checks.

What else can I do to reduce the likelihood of our emails going to peoples spam folder, and Gmails promotions tab?

Email Header

	From =?utf-8?Q?The=20Bouq=27aneers?= Mon Mar 24 12:39:14 2014
	X-Apparently-To: [email protected] via 98.136.214.242; Mon, 24 Mar 2014 19:39:15 +0000
	Return-Path: <bounce-mc.us4_17409995.559249-theodore.boulard=yahoo.com@mail138.us4.mcsv.net>
	Received-SPF: pass (domain of mail138.us4.mcsv.net designates 205.201.128.138 as permitted sender)
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	X-Originating-IP: [205.201.128.138]
	Authentication-Results: mta1290.mail.bf1.yahoo.com  from=mail138.us4.mcsv.net; domainkeys=pass (ok);  from=mail138.us4.mcsv.net; dkim=pass (ok)
	Received: from 127.0.0.1  (EHLO mail138.us4.mcsv.net) (205.201.128.138)
	  by mta1290.mail.bf1.yahoo.com with SMTP; Mon, 24 Mar 2014 19:39:15 +0000
	DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=k1; d=mail138.us4.mcsv.net;
	 h=From:Reply-To:To:Date:Message-ID:List-Unsubscribe:Sender:Subject:Content-Type:MIME-Version; [email protected];
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	DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=k1; d=mail138.us4.mcsv.net;
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	   DY3vYdB8EteGo4VpmRk=;
	Received: from (127.0.0.1) by mail138.us4.mcsv.net id h624u6174lge for <[email protected]>; Mon, 24 Mar 2014 19:39:14 +0000 (envelope-from <bounce-mc.us4_17409995.559249-theodore.boulard=yahoo.com@mail138.us4.mcsv.net>)
	From: =?utf-8?Q?The=20Bouq=27aneers?= <[email protected]>
	Reply-To:  <[email protected]>
	To: =?utf-8?Q?=3C=3C=20Test=20First=20Name=20=3E=3E?= <[email protected]>
	Date: Mon, 24 Mar 2014 19:39:14 +0000
	Message-ID: <[email protected]>
	X-Mailer: MailChimp Mailer - **CIDa9958ea379**
	X-Campaign: mailchimpe9c7499aeda15720c6e28fa94.a9958ea379
	X-campaignid: mailchimpe9c7499aeda15720c6e28fa94.a9958ea379
	X-Report-Abuse: Please report abuse for this campaign here: http://www.mailchimp.com/abuse/abuse.phtml?u=e9c7499aeda15720c6e28fa94&id=a9958ea379&e=
	X-MC-User: e9c7499aeda15720c6e28fa94
	X-Feedback-ID: 17409995:17409995.559249:us4:mc
	X-Accounttype: pd
	List-Unsubscribe: <mailto:unsubscribe-e9c7499aeda15720c6e28fa94-a9958ea379-@mailin1.us2.mcsv.net?subject=unsubscribe>, <http://TheBouqs.us4.list-manage.com/unsubscribe?u=e9c7499aeda15720c6e28fa94&id=6f70b006f7&e=&c=a9958ea379>
	Sender: "The Bouq'aneers" <[email protected]>
	x-istest: yes
	Subject: =?utf-8?Q?=5BTest=5D=20=5BTEST=5D=20Spring=20has=20Sprung=20Reminder?=
	x-mcda: TRUE
	Content-Type: multipart/alternative; boundary="_----------=_MCPart_1211447354"
	MIME-Version: 1.0
	Content-Length: 41034


![Screenshot (Desktop on left, Mobile on right)][2]


  [1]: http://kb.mailchimp.com/article/authentication-for-mailchimp
  [2]: https://i.sstatic.net/5ZrTd.jpg

Isnotspam.com Test Results
---

SPF Check : pass
Sender-ID Check : pass
DomainKeys Check : neutral
DKIM Check : pass
SpamAssassin Check : ham (non-spam)
==========================================================
Details:
==========================================================

HELO hostname: mail94.us2.mcsv.net
Source IP: 173.231.139.94
mail-from: [email protected]
Anonymous To: [email protected]
---------------------------------------------------------
SPF check details:
----------------------------------------------------------

Result: pass
ID(s) verified: [email protected]
DNS record(s):
thebouqs.com. 300 IN TXT "v=spf1 include:spf.protection.outlook.com -all"
thebouqs.com. 300 IN TXT "v=spf1 mx include:_spf.google.com ~all"


----------------------------------------------------------
Sender-ID check details:
----------------------------------------------------------

Result: pass

ID(s) verified: [email protected]
DNS record(s):
thebouqs.com. 300 IN TXT "v=spf1 include:spf.protection.outlook.com -all"
thebouqs.com. 300 IN TXT "v=spf1 mx include:_spf.google.com ~all"


----------------------------------------------------------
DomainKeys check details:
----------------------------------------------------------

Result: neutral (message not signed)
ID(s) verified: [email protected]
Selector=
domain=
DomainKeys DNS Record=

----------------------------------------------------------
DKIM check details:
----------------------------------------------------------

Result: pass
ID(s) verified: [email protected]
Selector=k1
domain=mail94.us2.mcsv.net
DomainKeys DNS Record=k1._domainkey.mail94.us2.mcsv.net

----------------------------------------------------------
SpamAssassin check details:
----------------------------------------------------------
SpamAssassin v3.3.1 (2010-03-19)

Result: ham (non-spam) (0-1.9points, 10.0 required)

pts rule name description
---- ---------------------- -------------------------------


* -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no
* trust
* [173.231.139.94 listed in list.dnswl.org]
* -0.0 RCVD_IN_IADB_UT_CPR_MAT RBL: IADB: Sends no material under Utah's
* CPR
* [173.231.139.94 listed in iadb.isipp.com]
* -0.1 RCVD_IN_IADB_DK RBL: IADB: Sender publishes Domain Keys record
* -0.0 RCVD_IN_IADB_SENDERID RBL: IADB: Sender publishes Sender ID record
* -0.2 RCVD_IN_IADB_RDNS RBL: IADB: Sender has reverse DNS record
* -2.2 RCVD_IN_IADB_VOUCHED RBL: ISIPP IADB lists as vouched-for sender
* -0.0 RCVD_IN_IADB_LISTED RBL: Participates in the IADB system
* -0.1 RCVD_IN_IADB_SPF RBL: IADB: Sender publishes SPF record
* -0.0 SPF_HELO_PASS SPF: HELO matches SPF record
* -0.0 SPF_PASS SPF: sender matches SPF record
* -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain
* 1.0 DK_SIGNED DK_SIGNED
* 0.1 HTML_MESSAGE BODY: HTML included in message
* 0.0 BAYES_50 BODY: Bayes spam probability is 40 to 60%
* [score: 0.5000]
* 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily
* valid
* -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
X-Spam-Status: Yes, hits=-1.9 required=-20.0 tests=BAYES_50,DKIM_SIGNED,
DKIM_VALID,DK_SIGNED,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,RCVD_IN_IADB_DK,
RCVD_IN_IADB_LISTED,RCVD_IN_IADB_RDNS,RCVD_IN_IADB_SENDERID,RCVD_IN_IADB_SPF,
RCVD_IN_IADB_UT_CPR_MAT,RCVD_IN_IADB_VOUCHED,RP_MATCHES_RCVD,SPF_HELO_PASS,
SPF_PASS autolearn=no version=3.3.1
X-Spam-Score: -1.9