Product manual

GFI MailEssentials 7 Anti-Spam | 113
Important notes
1. The DNS server must be properly configured for this feature to work. If this is not
the case, time outs will occur and email traffic will be slowed down. For more
information refer to: http://go.gfi.com/?pageid=ME_ProcessingSlow
2. Querying an IP DNS Blocklist can be slow (depending on your connection), so email
can be slowed down a little bit.
3. Ensure that all perimeter SMTP servers are configured in the Perimeter SMTP
servers dialog so that GFI MailEssentials can check the IP address that is
connecting to the perimeter servers. For more information, refer to Perimeter
SMTP Server Settings (page 148).
Configuring IP DNS Blocklist
1. Go to Anti-Spam > Anti-Spam Filters > IP DNS Blocklist.
Screenshot 61: IPDNSBlocklist
2. Configure the following options:
Option Description
Check whether the sending mail server is on
one of the following IP DNS Blocklists:
Select to enable the IPDNSBlocklist filter.
Add IPDNSBlocklist If required, add more IP DNS Blocklists to the ones already listed. Key
in the IP DNS Blocklist domain and click Add IPDNSBlocklist.
Enable Selected Select an IPDNSBlocklist and click Enable Selected to enable it.
Disable Selected Select an IPDNSBlocklist and click Disable Selected to disable it.
Remove Selected Select an IPDNSBlocklist and click Remove Selected to remove it.