HSTS Expired certificate

Dear Forum

Certificates expired today. From Plesk I renewed successful. Website is ok. But email client does not recognize the new certificate. Thunderbird shows still the old certificate. For your information: Plesk 12.5, Postfix, Debian 8.9
How do I fix that?

Are the email clients using the same domain name and HTTPS protocol, or a different domain name, or a different protocol like IMAPS?

you should really fill out the fields

such as your domain

renewing your certificate may not mean that your mail server is using the new certificate

review the testing process here: Tutorial - Testing Mail Protocols with SSL/TLS


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