Release 1.6.4 * [Feature] Add method to get all content-type attributes in Lua * [Feature] Add some sanity checks for actions and controller * [Feature] Allow randomly select User-Agent from a list * [Feature] Deal with obscured URLs with @ symbols * [Feature] Milter headers: support adding/removing arbitrary headers from config * [Fix] Add another workaround to display history properly * [Fix] Add missing rspamadm control options to help * [Fix] Auth-Results: Multiple DKIM signatures * [Fix] Crash in URL processing * [Fix] Default monitoring domain for surbl plugin * [Fix] Detection of maillist optimized and fixed * [Fix] Do not cache SPF records with PTR elements * [Fix] Fix blacklists and DMARC in whitelist * [Fix] Fix exceptions list in surbl * [Fix] Fix processing of closed tags * [Fix] Fix PTR processing in SPF * [Fix] Lowercase HTTP headers to make them searchable from Lua * [Fix] options.local_networks setting * [Fix] Ratelimit: lowercase email addresses * [Fix] Rebalance and slightly rework MX check plugin * [Fix] Redis script loading in DMARC; URL tags; URL reputation * [Fix] Reject invalid bh for DKIM signatures earlier * [Fix] Remove incorrect method `task:set_metric_subject` * [Fix] Rewriting subjects via force actions module * [Fix] RPM postinstall * [Fix] Treat 'rewrite subject' as spam action * [Fix] Try harder to find urls * [Fix] Use full URL when making an HTTP request * [Fix] Use raw urls when sending requests to redirector * [Fix] Use weight from map for fuzzy scoring * [Rules] Penalise R_BAD_CTE_7BIT for utf8 messages