class Net::SMTP

def tcp_socket(address, port) 

def tcp_socket(address, port)
  begin
    Socket.tcp address, port, nil, nil, connect_timeout: @open_timeout
  rescue Errno::ETIMEDOUT #raise Net:OpenTimeout instead for compatibility with previous versions
    raise Net::OpenTimeout, "Timeout to open TCP connection to "\
      "#{address}:#{port} (exceeds #{@open_timeout} seconds)"
  end
end