1) Choose a policy

You need to chose a policy first. You may either deny or allow hosts known to be within certain geographic locations. It may be wise to pick a permissive approach by denying only a few countries rather than the opposite. Note that you can totally deny-none or allow-all and use this service just for monitoring purposes

2) Monitoring

The system can track and privately report you the geographic statistics of your SMTP traffic. You need to declare the IP address of yourSMTP server and verify your email address prior to getting your account activated. May you wish to unsubscribe at any time, all data related to your account will be deleted.

Click here for a preview of the monitoring page.

3) Chose your locations

select a list of countries you want to deny/allow

4) Test your RBL

verify your RBL with a few addresses.
e.g: 194.2.218.254 is in France

$ host -t txt 254.218.2.194.0.0.0.0.geobl.spamanalysis.org

5) MTA configuration

a) Configuring postfix

# main.cf
smtpd_recipient_restrictions= 
 permit_mynetworks,
 permit_sasl_authentication,
 [.....]
 reject_rbl_client 0.0.0.0.geobl.spamanalysis.org
  

 $ postfix reload

b) Configuring sendmail

# sendmail.mc
FEATURE(dnsbl, '0.0.0.0.geobl.spamanalysis.org',
	'Rejected, see http://spamanalysis.org')dnl

$ m4 sendmail.mc > sendmail.cf

$ /etc/init.d/sendmail restart

c) Configuring qmail