I've setup Amazon SES as the SMTP relayhost in my postfix configuration on the EC2 instance. The domain a.b has been verified by Amazon as well with following properties:
- Email Feedback Forwarding: enabled
- DKIM Settings Generated: yes
- Bounce Notifications SNS Topic: none
- DKIM Verification Status: verified
- Complaint Notifications SNS Topic: none
- DKIM Signing: enabled
- Delivery Notifications SNS Topic: none
- MAIL FROM Domain:
contact.a.b
where, I want my application to send emails as noreply@contact.a.b. My actual email reception/delivery is handled by zoho services. It has been configured not to receive emails for any of the subdomain accounts.
Now, to the actual problem. I sent an email using mail command as follows:
echo "Test mail from postfix" | mail -s "Test Postfix" hjpotter92@a.b -a "From: Mailing Daemon <noreply@contact.a.b>"
and the email was received as spam in my zoho inbox. Checking the original message, I notice that both; the SPF and the DKIM headers are present:
Delivered-To: hjpotter92@a.b
Received-SPF: pass (zoho.com: domain of contact.a.b designates 54.240.27.38 as permitted sender) client-ip=XX.XX.XX.XX; envelope-from=uuid+timestamp@contact.a.b; helo=a27-38.smtp-out.us-west-2.amazonses.com;
Authentication-Results: mx.zoho.com;
spf=pass (zoho.com: domain of contact.a.b designates XX.XX.XX.XX as permitted sender) smtp.mailfrom=uuid+timestamp@contact.a.b;
Received: from a27-38.smtp-out.us-west-2.amazonses.com (a27-38.smtp-out.us-west-2.amazonses.com [XX.XX.XX.XX]) by mx.zohomail.com
with SMTPS id 1474914100783465.00613467540006; Mon, 26 Sep 2016 11:21:40 -0700 (PDT)
Return-Path: <uuid+timestamp@contact.a.b>
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
s=rncj6athd6keffyests3zpklorp6m33m; d=a.b; t=1474914098;
i=@contact.a.b; h=Subject:From:To:Message-Id:Date;
<KEY CONTENT REDACTED>
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
s=gdwg2y3kokkkj5a55z2ilkup5wp5hhxx; d=amazonses.com; t=1474914098;
h=Subject:From:To:Message-Id:Date:Feedback-ID;
<KEY CONTENT REDACTED>
Subject: Test Postfix
From: Mailing Daemon <noreply@contact.a.b>
To: <hjpotter92@a.b>
X-Mailer: mail (GNU Mailutils 2.99.98)
Message-ID: <some-id-here@us-west-2.amazonses.com>
Date: Mon, 26 Sep 2016 18:21:38 +0000
X-SES-Outgoing: 2016.09.26-54.240.27.38
Feedback-ID: 1.us-west-2.IMI7x8kfSuWfF4qNyPxetCzCifHnf+9N5Q1IqSPbtZA=:AmazonSES
X-ZohoMail-Owner: <uuid+timestamp-here@us-west-2.amazonses.com>+zmo_0_<same-uuid+timestamp@contact.a.b>
X-ZohoMail-Sender: 54.240.27.38
X-ZohoMail: RSF_0 Z_633815312 SPT_1 Z_633815311 SPT_1 Ss2 SS_1 SFPZM SFPP UW2468 UB2468 COSF UMS_NDWSD_EXT_Z5 UMS_SPPND_8 SGR1_1_2_0_27046_162
X-Zoho-Virus-Status: 2
So, why is the email received is marked as spam by zoho? My DNS manager (cloudflare) does not contain MX record for contact.a.b domain, as I do not wish to receive/handle the emails received there. Could this be the issue, because this answer mentions existence of forward and reverse DNS values.
PS: I'm currently in the sandbox mode of SES, but have already requested a limit increase. If the sandbox mode could be the issue!
