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In case of hMailServer, you would need to install the server certificate for the domain that hMailServer manages by:
Add the server's certificate (.crt) and private key (.key) in Settings>Advanced>SSL Certificates
Set SMTP/POP3/IMAP to use the above SSL Certificate
SMTP: set Connection security to STARTLS (Optional), and then pick the SSL Certificate.
POP3/IMAP: set Connection security to STARTLS (Required), and then pick the SSL Certificate.
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