OK so been looking into it more.
Seems like I don’t have PTR records set, this must be done by ISP so i’ve sent a request.
Also noticed my dmarc&dkim wasn’t a 100% done correctly.
However. I do score a respectable 7,8 in mailtester.
And surely dmarc/dkim is more related to sending than receiving.
@pike, I can open port 587, sure but I cannot see that it would help. I’ll give it a try.
Thanks for all the help guys!