Files:

GenerateSenderKey.sh		- Optional.  Generate a signing/encrypting key and certificate
SendEncryptedEmail.sh		- Send the email!

email_body.txt			- The body of the email.  Duh.
recipient-certificate.pem	- Sample recipient certificate (for encryption)
sender-certificate.pem		- Sample sender certificate (for signing)
sender-key.pem			- Sample (I swear) sender private key (for signing/encryption)
smime.cfg			- OpenSSL config file to add S/MIME extensions to the Sender's certificate


Postfix Configuration:

[ Add to the bottom of /etc/postfix/main.cf (Mac) ]
relayhost = mysmtpserver.fqdn
mydomain = mydomain.fqdn

[ Restart postfix (Mac) ]
$ sudo postfix reload