Hi,
Would be useful to have a native blacklist check for the Name servers (names and IPs) of the sender domain and unverified client domain name. I've been using scripts to achieve this and and the results are effective in the following cases: - when the spammer rotates the IPs, Domain names and subdomains. - when the spammer uses new TLDs with tolerant registrars or hosts his own NS. - existent RBLs (listing IPs) can be used for NS check. Weight would provide granularity instead of just a black or white action. I've noticed Postfix is already resolving the Name servers. I presume much of the necessary work is already there. Thank you. Marius.
smime.p7s
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