Usage TODO References https://www.ndchost.com/wiki/mail/test-smtp-auth-telnet http://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/DEBUG_README_004.html http://serverfault.com/questions/547282/postfix-how-to-use-simple-file-for-sasl-authentication http://www.postfix.org/postconf.5.html