Contents
$ telnet smtp.gmail.com 587 Trying 64.233.187.109... Connected to smtp.gmail.com. Escape character is '^]'. 220 smtp.gmail.com ESMTP pw3-20020a17090b278300b002839de4d348sm9903616pjb.9 - gsmtp helo wk.qmail.jp 250 smtp.gmail.com at your service f^H 502-5.5.1 Unrecognized command. For more information, go to 502 5.5.1 https://support.google.com/a/answer/3221692 pw3-20020a17090b278300b002839de4d348sm9903616pjb.9 - gsmtp mail from tmaeno@m.qmail.jp 530-5.7.0 Must issue a STARTTLS command first. For more information, go to 530-5.7.0 https://support.google.com/a/answer/3221692 and review RFC 3207 530 5.7.0 specifications. pw3-20020a17090b278300b002839de4d348sm9903616pjb.9 - gsmtp starttls 220 2.0.0 Ready to start TLS helo FConnection closed by foreign host.