Hello @thomashart ,
I was able to test send your emails and receive them in my regular inbox right away, without the warning message. However, I am not you, which is what your email program is likely having an issue with. When you send an email to yourself through us - test or otherwise - it has the chance to trigger this warning message or be spammed out depending on your email program's settings. This is because it's an email being sent to you, claiming to be from yourself, but actually coming from a different source (us). For you, it should be as simple as dragging the email into your regular inbox, or explicitly clicking the "Looks Safe" button to teach your email program's algorithm to trust it.
Here are some general best practices for deliverability. Deliverability can have a lot of variables, from elements on our side, on your side, on the recipient's side, and in their email system company's side. It's also a good idea to set up self-authentication since you have an email address with its own domain. Typically you'd only want to use the ccsend rewrite if you're only sending from a free address like Gmail, Yahoo, AOL, Hotmail, Verizon, etc.
If you'd like to learn more about safelisting, and what it entails:
If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Deliverability agents, or see our Email Authentication FAQ for additional info.
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William A
Community & Social Media Support