howto setup, test, spamcheck, …
port 25:
telnet example.com 25 Trying 88.88.42.23... Connected to example.com. Escape character is '^]'. 220 example.com ESMTP ehlo testing ...
you should receive some STARTTLS auth lines.
check cert:
openssl s_client -starttls smtp -crlf -connect synoptx.net:25
links:
http://www.mad-hacking.net/documentation/linux/applications/mail/using-ssl-tls-postfix-courier.xml
http://qmail.jms1.net/test-auth.shtml
http://www.cyberciti.biz/tips/ssl-certificate-installation-courier-imap-server.html
mail -s "Hello world" info@example.com
then enter body + 2x Ctrl+D
echo "This will go into the body of the mail." | mail -s "Hello world" info@example.com