[charamis]

Glad you're pointing it out. I still have problems, indeed, having my emails flagged as spam when sent to outlook.com. On gmail.com they go straight to the inbox.

If I understand correctly though, I should have to set a reverse PTR record in the case of setting up my own mail server, right? And I should configure it on the mailserver's side, correct? That's not my case though, I'm just using a custom domain with the MX records pointing to the mail service that I'm using.

I'll just wait a few days cause the domain is new and I guess that's the reason outlook.com flags it.