Hello, > Instead, the upstream anti-spam RBLs are disappearing entirely (perhaps > due to DDoS attack), so after the local cache entry expires, our local > cache gets no response from the RBL and thus obtains nothing to cache, > whence lookups to the local cache for those entries end up hanging until > they time out.
I don't think there is a way in exim to change its TTL rate. Increasing the DNS TTL might work, but you still have the issue of the TTL timeout being reached. A private list of non-responsive RBLs then is the best option. You'll have to devise some way of testing the RBLs (out side of Exim) periodically to determine in they are back online. --- DynaStop: Stopping spam one dynamic IP address at a time. http://tanaya.net/DynaStop/ -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
