To enable MAPS SPAM Protection, Begin by selecting “SERVER” then “MAIL” then “MAPS ZONES”. You can use spamcop or spamhaus for this. For spamhaus you can use “zen.spamhaus.org”.
ZEN is the combination of all Spamhaus DNSBLs into one single powerful and comprehensive blocklist to make querying faster and simpler. It contains the SBL, the XBL and the PBL blocklist.
Other you can user spamcop.net
The SpamCop Blocking List (SCBL) lists IP addresses which have transmitted reported email to SpamCop users. SpamCop, service providers and individual users then use the SCBL to block and filter unwanted email. The SCBL is a fast and automatic list of sites sending reported mail, fueled by a number of sources, including automated reports and SpamCop user submissions. The SCBL is time-based, resulting in quick and automatic delisting of these sites when reports stop. 
If you want to enter multiple lists, separate the lists by semicolon. For example: “maps1.domain.com” or “maps1.domain.com;maps2.domain.com”.
Enable Maps Spam Protection
