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require 'net/smtp'

sender = '[REMETENTE]'
recipient = 'conta@dominio.com'
from = "Joao Silva <#{sender}>"
user = '[USUARIO]'
pass = '[SENHA]'

message = <<MESSAGE_END
From: #{from}
To: #{recipient}
Subject: TITULO

This is a test e-mail message.
MESSAGE_END

Net::SMTP.start('smtplw.com.br', 587, sender, user, pass, :login) do |smtp|
  smtp.send_message message, sender, [recipient]
end