DNSBL ::
QuickMail Pro Server 3.5.1 can be configured to use a DNSBL (Domain Name System based Blackhole List) to determine if it should accept an incoming SMTP connection.
This feature was added to help protect your QuickMail Pro server against spammers and to help prevent spam from reaching your users.
When enabled, your server will check if the IP address of the machine trying to make a SMTP connection is blacklisted by the specified DNSBL. If the IP address is blacklisted, your server will gracefully reject the SMTP connection.
Some freely available third party blacklists are:
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