Add SPF for outlook mail, can't deliver any mails

I don’t understand why I can’t deliver any mails. I should add a SPF for my outlook mail, but I don’t understand what I need to fill in at domain and I don’t know where to find the IP adress. Can someone help me?

  1. What is your domain name?

  2. Who is your email provider service provider? When you say “Outlook mail”, do you mean you’re using Microsoft/Office 365 email service? Or are you merely configuring the Outlook software to use email service from another provider?

I think my domain name is Yes I’m using Microsoft/Office 365 email service