telnet mx7.oi.com.br 25
Trying 177.154.139.187...
Connected to mx7.oi.com.br.
Escape character is '^]'.
220 oi-mta-02.oi.com.br -- Server ESMTP (Oracle Communications Messaging Server 7.0.5.36.0 64bit (built May 29 2015))
EHLO comunicados@oivendecomunica.com.br
250-oi-mta-02.oi.com.br
250-8BITMIME
250-PIPELINING
250-CHUNKING
250-DSN
250-ENHANCEDSTATUSCODES
250-HELP
250-XLOOP 29DA4F71FDF05460B6B03521EC39362B
250-AUTH PLAIN LOGIN
250-AUTH=LOGIN PLAIN
250-ETRN
250-NO-SOLICITING
250 SIZE 0
MAIL FROM comunicados@oivendecomunica.com.br
501 5.5.4 No FROM: in MAIL/SAML/SEND/SOML.
MAIL FROM: comunicados@oivendecomunica.com.br
250 2.5.0 Address Ok.
RCPT TO: rr1021363aguiar@oi.com.br
250 2.1.5 rr1021363aguiar@oi.com.br OK.