slightly OT but don't know a better list - has somebody a larger list of parking-only nameservers than below? sadly you find easily parking companies but not the dedicated nameservers or a clear information if they are *really* used only for the parked domains
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check_sender_ns_access hash:/etc/postfix/blacklist_ns.cf

ns1.sedoparking.com  REJECT Domain is parked at sedo.com
ns2.sedoparking.com  REJECT Domain is parked at sedo.com
ns1.fastpark.net     REJECT Domain is parked at namedrive.com
ns2.fastpark.net     REJECT Domain is parked at namedrive.com
a.ns.ultsearch.com   REJECT Domain is parked at a.ns.ultsearch.com
b.ns.ultsearch.com   REJECT Domain is parked at b.ns.ultsearch.com
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phishing example:

Nov 2 07:43:51 mail-gw postfix/smtpd[18486]: NOQUEUE: reject: RCPT from ns1.hostingstation.biz[64.79.106.75]: 554 5.7.1 <em...@administrator.com>: Sender address rejected: Domain is parked at a.ns.ultsearch.com; from=<em...@administrator.com> to=<***> proto=ESMTP helo=<ns1.hostingstation.biz>

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