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#### Switching On Spam Protection Based on DNS Blackhole Lists

You can use free and paid subscription blackhole lists with your server. Visit http://spamlinks.net/filter-dnsbl-lists.htm and choose a DNSBL server you want to use.

To switch on spam protection based on DNSBL:

1. Go to Home > Mail Server Settings (in the Server group).
2. Select the Switch on spam protection based on DNS blackhole lists check box.
3. In the DNS zones for DNSBL service input box, specify the host name that your mail server should query, for example: sbl.spamhaus.org.
4. Click OK.

Now, e-mail messages from known spammers should be rejected with an error code 550 (connection refused).