Open Properties of Message Delivery at Global Settings Container
In Connection Filter add new rule:
Name: spamhaus.org
DNS Suffix: sbl-xbl.spamhaus.org
Close Window by clicking OKs
Go to SMTP Virtual Server Properties, at General click Advance.
Edit the identity, Check the 'Apply Connection Filter' checkbox
Close Window by clicking OKs
To check the RBL settings send any mail to: nelson-sbl-test@crynwr.com
Wait a few minutes, the test results will reply your mail, read it.
OK message:
helo sbl.crynwr.com 250 mail.realdomain.co.il Hello [192.203.178.107] mail from:<> 250 2.1.0 <>....Sender OK rcpt to:
550 5.7.1 192.203.178.107 has been blocked by sbl-xbl.spamhaus.org Terminating conversation
OR:
554 5.7.1 This message has been blocked because it is from a RBL/ORDBL IP address. Terminating conversation
NOT OK message:
250 2.6.0 <1091519727@sbl.crynwr.com> Queued mail for delivery quit Successful termination. As far as I can tell, the email was delivered.
That might not be what you want.
Read how to test if your exchnage is open relay
