
On the 'General' tab, please ensure that the check box stating 'Check whether the sending mail server is on one of the following DNS Blacklists': is checked and at least 2 DNS Blacklists are enabled from the list.

Please confirm this by going to the GFI MailEssentials configuration > 'Anti-Spam Settings' and go through the configuration for the modules you would like to use to filter spam.

The efficiency of GFI MailEssentials can however depend on the setup being installed in. On most installations, GFI MailEssentials is designed to start filtering most spam emails immediately after it has been installed.

After installing GFI MailEssentials, SPAM emails are still delivered to the users’ mailboxes.
