SPAM check modules

Hi All,
I am working with email gateway to send our marketing emails. Often I have seen many refusals due to bad content formatting. My emails are categorized as SPAM by ISP.

We have drupal content management system and an add on to send mass emails , I am rying to use SPAM check sites as below. Somehow it's not working for me, these sites return same spam score for any of email.

Does anyone know a good freeware email spam checking gateway.

http://spamcheck.postmarkapp.com/ 
https://www.senderscore.org/index.php

Thanks
crazywolf2010Asked:
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Jared LukerConnect With a Mentor Commented:
If you can get a look at the headers of the messages that are being blocked (or flagged), then you could see what system they are using (Barracuda, Spam Assassin, etc) and then try to figure out what it is about your messages that they don't like.  Spam filtering can be very subjective and varies greatly from vendor to vendor.
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crazywolf2010Author Commented:
Didn't address the real issue
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