TLSv1.2 version support for mail protocols.
TLSv1.2 is supported for SMTP and IMAP. TLSv1 and TLSv1.1 can also be removed since it is depreciated.
Please go to
Admin > Security Settings and remove TLSv1 and TLSv1.1 and save it as highlighted below, ensure TLSV1.2 is enabled.
Ensure you do restart of application service for the changes to take effect.
In certain cases even after updating the settings, when you test the site via SSL Labs or other tools, if it shows that the site still supports TLS 1.0 and TLS 1.1.
Kindly Check if you were doing SSL offloading and if so, disable TLS 1.0/1.1 on the Load Balancer and test the site again.
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