- http://www.opensquad.com/blog/testing-imap-and-smtp-authentication-with-telnet/
- https://noknow.info/it/postfix/solved_ssl_routines_renegotiate?lang=en
- Create base64 string of username and password:
# With the base64 binary
echo echo -ne '\0login\0password' | base64
ZWNobyAtbmUgXDBsb2dpblwwcGFzc3dvcmQK