Go to mail-tester.com and enter the email address you used:
Then submit that page and that will give you your spam report and score: 7.7. The two biggest issues are that you don't have a correct SPF record or DKIM signature. There are links on that page on how to correct those issues. Correcting those will get you to 9.7
If you also set your FROM address to a valid email address from the same domain, then I think that would get you to 10/10.