Prerequisitesīefore proceeding with the described solution steps, ensure that you are logged on to GFI MailEssentials administration console using an account with administrative privileges. Items remain in the cache for 4 days and are cleared each time the AS Scan Engine service is restarted. GFI MailEssentials maintains a cache with the results of queries to the IP DNS Blocklist to avoid querying the IP DNS Blocklists multiple times for the same IP address, resulting in faster responses for the items that are found in the cache.
The DNS Blacklist module (DNSBL) makes use of DNS to check the IP address of the sending mail server with third-party DNSBLs (like ).
The GFI MailEssentials IP DNS Blocklist filter verifies that the IP address of the sending mail server is not known to send spam emails.
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