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To install your SSL certificate on a Postfix server, you will need three files. First, you will
need the private key that was created when you made your CSR. Second, you will need the .cer file
from the ZIP file that was e-mailed to you by Trustwave (this is your actual SSL certificate). Third,
you will need the xroot.crt file from the ZIP file that was e-mailed by Trustwave.
If you have misplaced your xroot.crt file, you can download it here:
Download the Trustwave intermediate certificate bundle
Your private key and certificate need to be in the same file for Courier IMAP to work with them.
Create a new text file which contains your private key above your certificate. The easiest way to do
this is to open your certificate in a text editor (the .cer file from the e-mail), copy the entire
certificate and paste it into a separate file.
Then, open your private key (it was created when you made your CSR) in a text editor and paste it in its entirety
right after the certificate. When you're creating your file, be sure that there are no line feeds
after the certificate.
When you are finished, your new file should look like this:
-----BEGIN CERTIFICATE-----
***** Encrypted certificate data
-----END CERTIFICATE-----
-----BEGIN RSA PRIVATE KEY-----
***** Encrypted private key data
-----END RSA PRIVATE KEY-----
Save this new file as Trustwavecert.pem that you created along with the xroot.crt
into a safe directory where you store SSL certificates and keys.
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U.S. or 
Canada)
