Telnet: Erro > 530 5.7.0 Must issue a STARTTLS command first

[denisduarte]

[aprendendo a usar o terminal...]

Ao tentar enviar um email teste a partir do terminal, me deparo com a mensagem: "Must issue a STARTTLS command first".
Algo a ver com criptografia?

root@denis-laptop:/home/denis# telnet smtp.gmail.com 25
Trying 74.125.67.109...
Connected to gmail-smtp-msa.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP g5sm3109206yhm.26
helo yahoo.com.br
250 mx.google.com at your service
mail from: meuemail@yahoo.com.br
530 5.7.0 Must issue a STARTTLS command first. g5sm3109206yhm.26
rcpt to: meuoutroemail@gmail.com
530 5.7.0 Must issue a STARTTLS command first. g5sm3109206yhm.26
data
530 5.7.0 Must issue a STARTTLS command first. g5sm3109206yhm.26
Subject: Mensagem Teste
502 5.5.1 Unrecognized command. g5sm3109206yhm.26

[maxcedro]

Dá uma olhada nesse link, talvez ajude.

http://www.ig.com.br/email/help/ig_acesso_pop14.html