Hello @MMIC,
Sending emails to, and from the same address will often trigger spoofing warnings. Ironically this means that sending emails to yourself, is often the least effective way of testing spam-boxes, as your own inbox security programs will often recognize that you did not actually send that email. There are a few ways around this though. The most effective solution for yourself and all of your contacts, would be to publish a dkim key, and set up self-authentication. You can find a walkthrough of that here.
While we can continue trying to troubleshoot through our forum, this is sometimes a more complicate procedure, and it may be more timely for you to contact our Deliverability specialists in the Account Review Department at any of the numbers listed here.
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