Problem when a certificate Renew

I have multiple servers with CWP with multiple domains of clients, from times to times my clients have errors caused by the certificate, I think is when the certificate renew the mail server continue to use the old one.

Most of the times to fix this I rebuild the mailserver but this is should somehow be handle automatically it's really annoying to have this issue.
Any tips to fix this?

The mail certificates and keys are located in the folders:

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CERTS - /etc/pki/tls/certs
KEYS - /etc/pki/tls/private/

If you believe the mail server just doesn't want to use the updated certs then try to restart the mail server whem one or more certs/keys are updated.

To do this just run:

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find /etc/pki/tls/private/ -name "*.key" -mtime -1 -exec service postfix restart \;
find /etc/pki/tls/private/ -name "*.key" -mtime -1 -exec service dovecot restart \;

using cron once a day.