- Plesk for Linux
- Plesk for Windows
The system does not block mail from IP’s listed at DNSBL providers configured in Tools & Settings > Mail Server Settings > DNS zones for DNSBL service, for example,
Some public DNS providers implement non-hijacked responses for known DNSBL zones like Spamhaus.
Check what DNS resolvers you are using: If free DNS servers like Google Public DNS are used, in most cases you will receive a not listed (NXDOMAIN) reply from Spamhaus’ public DNSBL servers. Use your own DNS servers when doing DNSBL queries to Spamhaus.
In other words, commonly used public resolvers such as Google’s
220.127.116.11 / 18.104.22.168 and
22.214.171.124 – 126.96.36.199 would not work with Spamhaus.
Proper DNS response:
# dig +short TXT 188.8.131.52.zen.spamhaus.org
As a workaround, you can specify other DNS servers. For example,
OpenDNS Home :