My domain is: dlfoundry.com
We had an SSL certificate from Let’s Encrypt Authority x3 from September to December this year. It is now expired, and a security alert is popping up in some of our user’s Outlook applications telling them that the certificate has expired. This certificate was not associated with our website. None of our staff remembers signing up for this certificate. But now that it’s expired, some of our users are not able to use their email properly.
How do I get a new certificate to use with Office 365 to bring operations back to normal?
I will try to provide any additional information you ask for.