Help! Cannot get rid of expired SSL certificates.

Keep having issue with iOS devices stating that my certificate is expired.

server: mail.azskin.com on Centos 8

If you use the SSL checkers used by CWP7 everything is listed as fine.

https://www.checktls.com/TestReceiver

if you put in my server it states that 1 out of 3 of the certificates is expired. Unsure how to remove that certificate.

Use the autossl option in CWP, to renew the certficate for azskin.com, and make sure you check the mail option as additional domains.

It seems that when the cert renewed, it did not update postfix with the new certificate.

Just saw a similar post.  Before doing anything else, try restarting postfix.  It may not have picked up the new certificate if it hasn't been reloaded/restarted.

Thanks for the helped.

I have tried those options and retried them again.

Still listing that 1 of the 2 certificates from the MX is expired.

Went updating the certificate it updated the 3rd certificate for the CA root store.

The certificate that is expired is your domains certificate.  You can check /root/.acme.sh/ for log files to find out why your cert is not renewing.