input: Write a function to validate a list of emails. The function should return a boolean indicating whether a given email address is valid.
  
  assert validate_mail_list(["example.user@gmail.com", "bad@example"])==False
  assert validate_mail_list(["test@example.com", "another.email@domain.net"])==True
  assert validate_mail_list(["user@domaincom", "name@.com"])==False
  assert validate_mail_list(["user@domain.com", "name@domain.co.uk"])==True
  assert validate_mail_list([])==True
output: def validate_mail_list(emails):
      import re
      pattern = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$'
      for email in emails:
          if not re.match(pattern, email):
              return False
      return True