blah.blan.com ssl almalinux 8.9

I am having an issue with pop3 email in gmail (I check some of my pop3 emails from gmail to keep from running email software on my computers at home and I can check gmail anywhere.

The issue is that I moved from a vps to a dedicated server and now I am having issues checking secure pop3 emails. See errors below:

Email address:   admin@blah.host
Unable to establish secure SSL connection to mail.blah.host
Server returned error: "SSL error: Leaf certificate is self-signed"

But I don't get it because I have been checking it the same way with blah.blah.com as the server hostname and mail.blah.com on the vps with the same data center and now it decides on the server it doesn't want to work? I did cwp->cwp migrate of accounts.

The server can't be mail.blah.com

The server must have a unique sub-hostname from your domain, most just use e.g. srv1.blah.com.

THEN you crate a user account with the hostname mail.blah.com

AND IF the A record is pointing correcting, the SSL certificate that you create will work.

CWP -> CWP Migration is tricky, it needs port 2304 open for TCP_IN & TCP_OUT.