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Courier IMAP

Before starting SSL installation, please collect SSL certificate issued for your domain name, your private key (was generated with your CSR file) and CA intermediate(s) certificate(s).

1 Create .PEM file

Open your SSL certificate (your_domain.crt) and private key (your_domain.key) with Notepad text document. Now open a new text document and paste the contents of certificate and key in the following order:
-----BEGIN CERTIFICATE-----
(your_domain.crt)
-----END CERTIFICATE-----
-----BEGIN RSA PRIVATE KEY-----
(your_domain.key)
-----END RSA PRIVATE KEY----- Save it as pack.pem

2. Locate and open imapd-ssl file (typically location is /usr/lib/courier-imap/etc/). Add the following lines:
TLS_CERTFILE=/path/pack.pem (.PEM file from step 1)
TLS_TRUSTCERTS=/path/ca.txt  (CA intermediate certificate)
Verify that next line (choosing TLS protocol) is allowing SSL3:
TLS_PROTOCOL=SSL3
3. Locate and open pop3d-ssl file (typically location is /usr/lib/courier-imap/etc/). Add the following lines:
TLS_CERTFILE=/path/pack.pem (.PEM file from step 1)
TLS_TRUSTCERTS=/path/ca.txt  (CA intermediate certificate)
4. Make sure that the .pem file is readable by root only. Restart the server - installation is finished.

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