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X-Spam-Details: * 0.0 URIBL_BLOCKED ADMINISTRATOR NOTICE: The query to URIBL was blocked.
* See
http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block * for more information.
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I have not read this entire thread, so Im sorry if this has been answered...
This error happens if you forward your network to a popular free DNS service like Google's 8.8.8.8 and 8.8.4.4. Too many queries from there upsets the URIBL servers. Use a less popular service. Cloudflare is working for me atm, and I think Verisign is good too.
Also, do yourself a favor and install smeserver-wbl, then use it to block entire domains like:
*.fr
*.fun
*.icu
*.id
*.pl
*.ru
*.xyz
If certain messages keep making it past, view the message source to know which server/domain to block.