Product manual

GFI MailEssentials 7 Anti-Spam | 109
Option Description
Use
LDAPlookups
Select to configure your LDAP settings if GFI MailEssentials is installed in SMTP mode. If your LDAP
server requires authentication, unmark the Anonymous bind option and enter the authentication
details that will be used by this feature.
NOTE
Specify authentication credentials using Domain\User format (for example master-
domain\administrator).
NOTE
In an Active Directory, the LDAP server is typically the Domain Controller.
3. In Block if non-existent recipients equal or exceed, specify the number of nonexistent
recipients that will qualify the email as spam. Emails will be blocked by Directory Harvesting if
all the recipients of an email are invalid, or if the number of invalid recipients in an email equals
or exceeds the limit specified.
NOTE
Avoid false positives by configuring a reasonable amount in the Block if non-existent
recipients equal or exceed edit box. This value should account for users who send
legitimate emails with mistyped email addresses or to users no longer employed with
the company. It is recommended that this value is at least 2.
4. Provide an email address and click Test to verify Directory Harvesting settings. Repeat the test
using a non-existent email address and ensure that Active Directory lookup fails.
5. Click Actions tab to select the actions to perform on messages identified as spam. For more
information, refer to Spam Actions - What to do with spam emails (page 135).
NOTE
If Directory Harvesting is set to run at SMTP level, only the Log Occurrence option will
be available in the Actions tab.
6. Click Apply.
Stage 2 - Selecting if Directory Harvesting should be done during the SMTP transmission.
1. Navigate to Anti-spam > Filter Priority, and select SMTP Transmission Filtering tab.
2. Select an option from the following:
Option Description
Switch to full email
filtering
Filtering is done when the whole email is received.
Switch to
SMTPtransmission
filtering
Filtering is done during SMTP transmission by checking if the email recipients exist before
the email body and attachment are received.
NOTE
If this option is chosen, Directory Harvesting will always run before the other spam
filters.
3. Click Apply.