Preferred DNS Server
IP address for preferred DNS Server. It is recommended you enter a local DNS in your local network.
Alternate DNS Server
IP address for secondly DNS Server, it is optional.
Acquires and fills DNS servers from your network.
Connections and threads
Threads for checking. Creating more thread will improve the checking speed.
Timeout for querying a mail exchange record, the default is 5 seconds.
Retry count for querying a mail exchange record, the default is 10 times.
Buffer MX Exchange query results
Queries buffered results in the application instead of always querying the DNS server. DNS caching speeds up your delivery.
Clear MX Exchange buffer before publish
Clears the buffer before you starting checking.