Creating a new imapd.pem self-signed certificate (with openssl)

openssl req -x509 -newkey rsa:1024 -keyout /usr/local/ssl_0.9.7g/certs/imapd.pem -out imapd.pem -days 3650

for unencrypted private key:
openssl req -x509 -newkey rsa:1024 -keyout /usr/local/ssl_0.9.7g/certs/imapd.pem -out imapd.pem -days 3650 -nodes


That's it.