1 problem and 1 fact of life.
Problem, Google thinks you faked the headers. Did you send from your store's admin (which is a terrible idea, try MailChimp). If you insist on sending from your admin, then contact your webhost and make sure your SPF record is setup correctly.... AND make sure in configuration >> email options that send from known domain is checked and you ARE sending from a domain based email address. Otherwise deliver-ability will just suck... and Google doesn't care whether you like it or not.
Fact of Life, Google is going to make your users click "yes, always display images from..." a hundred times before they actually make it a rule.
~Melanie
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**I answer questions in the forum, private messages are not conducive to a helpful community.