Rob McEwen wrote: > On 1/31/2012 12:40 PM, Phil Daws wrote: >> Just to follow up we have seen a huge decrease in the amount of SPAM >> received since we implemented the Invaluement RBLs. > [snip] > PS - you mentioned that you were going to try greylisting next. Be > careful because greylisting (1) can cause annoying delays and (2) some > e-commerce systems, newsletters, and alert systems are not setup to do > a retry--so order info can get lost due to greylisting
I would recommend not doing full greylisting, i.e. not for all clients. Use a set of criteria to greylist a subset. Criteria: DNS, HELO, etc. In my experience, selective greylisting is way more effective than any RBL. /Per Jessen, Zürich
