old_contents: #!/usr/bin/python3
  
  import os
  import logging as log
  import sys
  
  log.basicConfig(stream=sys.stderr, level=os.environ.get("LOG_LEVEL", "INFO"))
  
  os.system("flask mailu advertise")
  os.system("flask db upgrade")
  
  account = os.environ.get("INITIAL_ADMIN_ACCOUNT")
  domain = os.environ.get("INITIAL_ADMIN_DOMAIN")
  password = os.environ.get("INITIAL_ADMIN_PW")
  
  if account is not None and domain is not None and password is not None:
      mode = os.environ.get("INITIAL_ADMIN_MODE", default="ifmissing")
      log.info("Creating initial admin accout %s@%s with mode %s",account,domain,mode)
      os.system("flask mailu admin %s %s '%s' --mode %s" % (account, domain, password, mode))
  
  def test_DNS():
      import dns.resolver
      import dns.exception
      import dns.flags
      import dns.rdtypes
      import dns.rdatatype
      import dns.rdataclass
      import time
      # DNS stub configured to do DNSSEC enabled queries
      resolver = dns.resolver.Resolver()
      resolver.use_edns(0, 0, 1232)
      resolver.flags = dns.flags.AD | dns.flags.RD
      nameservers = resolver.nameservers
      for ns in nameservers:
          resolver.nameservers=[ns]
          while True:
              try:
                  result = resolver.query('example.org', dns.rdatatype.A, dns.rdataclass.IN, lifetime=10)
              except Exception as e:
                  log.critical("Your DNS resolver at %s is not working (%s). Please use another resolver or enable unbound via https://setup.mailu.io.", ns, e);
              else:
                  if result.response.flags & dns.flags.AD:
                      break
                  log.critical("Your DNS resolver at %s isn't doing DNSSEC validation; Please use another resolver or enable unbound via https://setup.mailu.io.", ns)
              time.sleep(5)
  
  test_DNS()
  
  start_command="".join([
      "gunicorn --threads ", str(os.cpu_count()),
      " -b :80 ",
      "--access-logfile - " if (log.root.level<=log.INFO) else "",
      "--error-logfile - ",
      "--preload ",
      "'mailu:create_app()'"])
  
  os.system(start_command)
  
new_contents: #!/usr/bin/python3
  
  import os
  import logging as log
  import sys
  
  log.basicConfig(stream=sys.stderr, level=os.environ.get("LOG_LEVEL", "INFO"))
  
  os.system("flask mailu advertise")
  os.system("flask db upgrade")
  
  account = os.environ.get("INITIAL_ADMIN_ACCOUNT")
  domain = os.environ.get("INITIAL_ADMIN_DOMAIN")
  password = os.environ.get("INITIAL_ADMIN_PW")
  
  if account is not None and domain is not None and password is not None:
      mode = os.environ.get("INITIAL_ADMIN_MODE", default="ifmissing")
      log.info("Creating initial admin accout %s@%s with mode %s",account,domain,mode)
      os.system("flask mailu admin %s %s '%s' --mode %s" % (account, domain, password, mode))
  
  def test_DNS():
      import dns.resolver
      import dns.exception
      import dns.flags
      import dns.rdtypes
      import dns.rdatatype
      import dns.rdataclass
      import time
      # DNS stub configured to do DNSSEC enabled queries
      resolver = dns.resolver.Resolver()
      resolver.use_edns(0, 0, 1232)
      resolver.flags = dns.flags.AD | dns.flags.RD
      nameservers = resolver.nameservers
      for ns in nameservers:
          resolver.nameservers=[ns]
          while True:
              try:
                  result = resolver.query('example.org.', dns.rdatatype.A, dns.rdataclass.IN, lifetime=10)
              except Exception as e:
                  log.critical("Your DNS resolver at %s is not working (%s). Please use another resolver or enable unbound via https://setup.mailu.io.", ns, e);
              else:
                  if result.response.flags & dns.flags.AD:
                      break
                  log.critical("Your DNS resolver at %s isn't doing DNSSEC validation; Please use another resolver or enable unbound via https://setup.mailu.io.", ns)
              time.sleep(5)
  
  test_DNS()
  
  start_command="".join([
      "gunicorn --threads ", str(os.cpu_count()),
      " -b :80 ",
      "--access-logfile - " if (log.root.level<=log.INFO) else "",
      "--error-logfile - ",
      "--preload ",
      "'mailu:create_app()'"])
  
  os.system(start_command)
  
subject: Update start.py