Email Sending Domain DNS is not Verifying
Use the following third party tools to verify that your DNS changes are published by your Nameserver by using the following tools:
TXT Records
https://toolbox.googleapps.com/apps/dig/#ANY/
DKIM and SPF Records
https://mxtoolbox.com/SuperTool.aspx
If your records are not showing up in these lookup tools, there is an issue with the records. You may need to reach out to the support of your Nameserver to get assistance with your records.