To install SSL on IMAP server you need single .pem file - it includes Private Key and SSL certificate. Usually this file is called: imapd.pem.
To create it, follow this instruction:
The imapd.pem file should like like this:
-----BEGIN RSA PRIVATE KEY-----
(your private key)
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
(your certificate)
-----END CERTIFICATE-----
Configuration of the server:
1. To view the fingerprint, use the command:
openssl x509 -noout -fingerprint -in ca-certificate-file
2. Make sure the CA file is in certs/ and run the command:
openssl x509 -noout -hash -in ca-certificate-file
3. And the following one:
openssl x509 -hash -noout -in my_ca.crt
4. To test your installation:
openssl verify -CApath certs server-certificate-file
5. If all went well you should get the following response:
your-herald2-server.pem: OK
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