Email certificate problem

The operating system my web server runs on is (include version):
Ubuntu 20.04TLS
I can login to a root shell on my machine (yes or no, or I don't know):
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

I have requested certificates for domain (website) and mail server, but I can't send emails.
Both certificates are different if it matters
I've checked the .pem files and they are on server
Rainloop client via admin dashboard shows "454 4.7.0 TLS not available due to local problem" error
Where can I start troubleshooting this?

Some how I have sorted this issue.
I've restarted VPS
Then issued another ssl certificate for mail.mydomain(.)com
Logged in Rainloop admin and connection test passed.


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