Problem my mailinabox mail server send spam

I have create my mail server using mailinabox I think everything is perfect

-clean server ip from contoba out of blacklist checked with many sites
-clean domain with 3 months old
-all checks in mailinbox green
-all tests in mail tester 10/10
-all dns record spf / dkim / dmarc / ptr / etc ok and checked with mxtoolbox

i try to send to my own gmail just some text without any links but all of my mails go to spam
is this normal or what is wrong i ?
i am worry to start make warmup sending 100 mails per day and double it daily and after one months find that my server send all to spam

Please only make one post.

ok but i did not get any answer till now is this new problem with mail in box or what ?