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Route 53 email spam

Since 2 months our email address gets abused by a spam
bot. It turns out that emails are send via our info@ email address to thousands of
recipients of which many mails bounce back and land back in our
inbox.



Our domain is hosted at the German
provider 1und1. I use route 53 nameservers in order to resolve the domain on
heroku.



Here is my mail relevant setup at route
53:



MX Servers
configured:




10
            mx01.kundenserver.de
20
            mx00.kundenserver.de


SPF
Record:



"v=spf1 a mx
            ~all"


TXT
Record:




"QH+******************"


After
the first spam attempt I have setup the SPF record hoping this would solve the problem
but it did not. Also according to SES statistics, it looks like the emails are not send
via SES so I can also guarantee that our website is working correctly and mails are not
send via the website.



It must be some other
clinch which I don't know about.



How can it be
that a spam bot is abusing our own email to send out spam?
How can I prevent
Spam mailings in the future?




Thanks
for any help.



/>

Header of one of the bounced spam
emails:





--===143084232====mail.ip.ncnet.ru=== Content-Type:
text/plain; charset="utf-8"




Failed
to deliver to '[xxxxxxx]@platicly.com' SMTP module(domain

@77.37.254.238|platicly.com) reports: platicly.com: DNS transaction

timeout




--===143084232====mail.ip.ncnet.ru=== Content-Type:
message/delivery-status



Reporting-MTA: dns;
mail.ip.ncnet.ru



Original-Recipient:
rfc822;<[xxxxxxx]@platicly.com> Final-Recipient:

rfc822;<[xxxxxxx]@platicly.com> Action: failed Status:
4.0.0





--===143084232====mail.ip.ncnet.ru=== Content-Type:
text/rfc822-headers



Received: from
[103.194.195.11] (account holiday_@ints.ru HELO
ycwep.com) by
mail.ip.ncnet.ru (CommuniGate Pro SMTP 5.2.12) with
ESMTPSA id 142886298;
Fri, 03 Jun 2016 13:55:17 +0400 From:
To: "EHarmonyPartner"
<[xxxxxxx]@live-bits.com>,
"EHarmonyPartner"
<[xxxxxxx]@octport.com>, "EHarmonyPartner" /><[xxxxxxx]@platicly.com>, "EHarmonyPartner" /><[xxxxxxx]@punkpiratesrombooks.com>, "EHarmonyPartner" /><[xxxxxxx]@rapidecho.com> Subject: nice story Date: Fri, 3 Jun
2016
12:28:46 +0300 Message-ID:

<00008d5d4f67$73c20ef1$bd5cd982$@braufabrik.de> MIME-Version:
1.0

Content-Type: multipart/alternative;

boundary="----=_NextPart_000_0001_7EFA7AF8.4214CADC" X-Mailer:
Microsoft
Outlook 15.0 Thread-Index: AdHD4OenOcoMJM/OvRLBDcH+5LF7TA==
Content-Language:
en-us




--===143084232====mail.ip.ncnet.ru===--


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