Estou tentando enviar um e-mail usando mail -s "hello" emailaddress e continuo recebendo o erro do postfix:
dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[173.194.206.27] said: 550-5.7.1 [213.122.175.146 1] Our system has detected an unusual rate of 550-5.7.1 unsolicited mail originating from your IP address. To protect our 550-5.7.1 users from spam, mail sent from your IP address has been blocked. 550-5.7.1 Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedIPError to review our 550 5.7.1 Bulk Email Senders Guidelines. v6si1966184qtv.466 - gsmtp (in reply to end of DATA command))
ou
algo relacionado ao registro PTR.
Alguém pode me ajudar por favor.