You can add an IP address to the IP whitelist in GFI MailEssentials, so they are not blocked.
- Open the GFI MailEssentials Configuration.
- Navigate to Anti-Spam > Anti-Spam Filters > Whitelist.
- Click on IP Whitelist.
- Check the box titled Enable IP Whitelist.
- Enter the IP Address in the Single computer/CIDR or you can add a subnet address of IP by selecting Group of Computers.
- Select Add.
- Click on Apply to save the configuration.