Instalando Postfix

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#####                 Criando Servidor de Envio de E-mail Automático                                 ######
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apt-get install postfix
apt-get install mutt
cp /etc/postfix/main.cf /etc/postfix/main.old
echo '' > /etc/postfix/main.cf
nano /etc/postfix/main.cf

  relayhost = [smtp.gmail.com]:587
  smtp_sasl_auth_enable = yes
  smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
  smtp_sasl_security_options = noanonymous
  smtp_tls_CAfile = /etc/postfix/cacert.pem
  smtp_use_tls = yes

/etc/init.d/postfix restart

nano /etc/postfix/sasl_passwd
  [smtp.gmail.com]:587 seuemail@seuprovedordeemail.com:suasenha

postmap /etc/postfix/sasl_passwd; postmap /etc/postfix/main.cf

/etc/init.d/postfix restart
mkfifo /var/spool/postfix/public/pickup ps aux | grep mail kill sudo /etc/init.d/postfix restart

sudo chmod 400 /etc/postfix/sasl_passwd
postmap /etc/postfix/sasl_passwd
newaliases

apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules
cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem
cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | tee -a /etc/postfix/cacert.pem
/etc/init.d/postfix reload

echo "Test mail from postfix" | mail -s "Test Postfix" seuemail@seuprovedor.com.br