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Sometimes odd content triggers Spam filters. I remember a case where the email creators had been cutting and pasting from a lot of Microsoft Office docs, which brought along lots of extra HTML code. There was probably six pages of code for every one page of email and spam filters didn't like it even though just viewing and reading the email things looked normal. Where I used to work our own marketing emails were snagged bu our Spam filter regularly for some reason we were not able to figure out.
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