c tls_connect localhost:1465

c <~ 220
c -> EHLO localhost
c <... 250 HELP

c -> AUTH PLAIN something
c <~ 501
c -> AUTH PLAIN something
c <~ 501
c -> AUTH PLAIN something
c <~ 501
c -> AUTH PLAIN something
c <~ 501
c -> AUTH PLAIN something
c <~ 503 5.7.8 Too many attempts, go away