On Mon, Dec 14, 2020, at 11:32, Mark E. Jeftovic via mailop wrote: > Hey all, we're looking to deploy some user-configurable options in our mail > filtering such as being able to select which RBLs and RHSBLs they want to > apply to their inbound messages.
> We already subscribe to some on a system wide level (Abusix) but I'm > wondering which ones over and above are still a thing, ie. spamcop? etc? > which ones are open or offer rsync or zone transfer ability if they want to > reduce load, and which ones are effective on general spam and malware > blocking with the fewer false positives. I'm running a few... The ones I believe are defaulted enabled: bl.spamcop.net, ix.dnsbl.manitu.net, bl.mailspike.net, z.mailspike.net, bl.spameatingmonkey.net, and noserver.dnsbl.sorbs.net. However, none of these are outright blocking, all are feeding input into a scoring system which can result in the message being accepted, greylisted (mostly to wait and see if there are more DNSBL hits by the next attempt), or treated as spam. In some cases a hit (spameatingmonkey.com's "Fresh" 0-15 lists) virtually guarantees a greylist while 15-30 puts them on a hair-trigger for greylisting. I have a handful of others, some of the other sorbs.net, and a few smaller ones have a small impact. Make sure these are active before using them, and measure the results. My scoring is not necessarily well tuned at this point as I have been fairly hands-off, and I have a couple things that will turn a list off for me (like if they list a couple test addresses, including myself).
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