There are two types of list that you have while using Avast Anti-Spam feature. One is White-list member which comprises of the list of members whose mails are never marked as spam and the other one is blacklist members whose mails are always treated as spam. You can manage both the list in your email server. For detailed information you can take help from knowledgeable technicians at 0808-101-2159 Avast Phone Number UK. He will give you step by step assistance to set up your blacklist and white-list mail addresses.