$ telnet localhost 587 Trying ::1... Connection failed: Connection refused Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 localhost ESMTP OK 503 Bad sequence of commands ehlo localhost 250-localhost 250-SIZE 20480000 250-AUTH LOGIN 250 HELP mail from:robot@avant-garde.no-ip.biz 250 OK data 503 Must have sender and recipient first. rcpt to:alexjaquet@gmail.com 530 SMTP authentication is required.