Blocking Unknown/Unresolved IP’s and Dont have rDNS PTR for Stop Pshising or Spam

Cara nya :

• Login to WHM
• Masuk ke menu exim configuration
• Pilih yang advanced config
• Masukan script berikut :

require verify = reverse_host_lookup
  message = Your mail server IP address ($sender_host_address) has no reverse DNS PTR
  

• Dengan tambahan allow sender

require verify = reverse_host_lookup
  message = Your mail server IP address ($sender_host_address) has no reverse DNS PTR
  !sender_domains = /etc/skiprdns

• Dengan tambahan Allow IP

require verify = reverse_host_lookup
  message = Your mail server IP address ($sender_host_address) has no reverse DNS PTR
  !hosts = 202.128.85.61