Your REVERSE DNS does not match with your sending domain

You may want to change your pointer (PTR type) DNS record and the host name of your server to the same value.
Here are the tested values for this check:

  • IP:
  • rDNS:

So, how do I change this in my settings? Thanks in advance for any help you could provide, Bryson

You can’t.

Both Reverse DNS (PTR) records, as well as the mail server’s HELO/EHLO name are things that are maintained by the the organisation that owns and control the IP space and operate the mail server(s), no one else are able to perform any changes to that.

In your situation, Microsoft (e.g. Office 365 / Outlook) would be the only party that can change these kind of things.