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→Postfix + TLS
Those commands will create a certificate, a certificate signing request, a certificate authority, and a sign your certificate with your certificate authority. Same as in the real world except there you would contact a real CA, here you're making up your own.
Now configure Postfix to use it, by adding the following to your main.cf file:
<pre># Settings to enable secure SMTP using my self-signed certificate:
smtpd_tls_auth_only = no
smtpd_use_tls = yes
smtp_use_tls = yes
smtpd_tls_auth_only = no
smtpd_tls_key_file = /etc/ssl/private/andrewsmith.org.key
smtpd_tls_cert_file = /etc/ssl/certs/andrewsmith.org.crt
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
tls_random_source = dev:/dev/urandom
smtpd_tls_loglevel = 1</pre>
=== Test with Thunderbird ===
