input: Write a function to validate a list of emails. The function should return a boolean indicating whether a given email address is valid.
  
  ### Input:
  mail_list = ["example.user@gmail.com", "bad@example"]
  
  ### Output:
  def validate_mail_list(mail_list):
      for mail in mail_list:
          if not re.match("[^@]+@[^@]+\.[^@]+", mail):
              return False
      return True
  assert validate_mail_list(["example.user@gmail.com", "bad@example"]) == False
  assert validate_mail_list(["example.user@gmail.com"]) == True
  assert validate_mail_list(["bad@example"]) == False
  assert validate_mail_list([]) == True
output: def validate_mail_list(mail_list):
      for mail in mail_list:
          if not re.match("[^@]+@[^@]+\.[^@]+", mail):
              return False
      return True