At 12:04 PM 10/4/02 +1200, Juha Saarinen wrote:
>I'm using a few DNSBLs here, to drop e.g. 419s from Nigeria and Yahoo.
>However, I've noticed that occasionally, the spam gets through, which is
>annoying.
>
>What could be the reason for this? My sucky ADSL connection, a DNS/network
>glitch elsewhere, or Exim "forgetting" to look up the culprit? AFAICT, DNS
>lookups at the various lists work fine, and return the expected answer.
>
>Still on 4.04 here, but will upgrade to 4.10 to see if it helps.
Two or three reasons -
# Spam coming through your backup MX (if any) - I notice saarinen.org
doesn't have one ...
# Spam coming from elsewhere (not all nigerian crap comes from nigeria or
yahoo - I terminate about a hundred or two of these moron's accounts every day)
# DNSBL lookup latency - stuff like djb's rbldns
(
http://cr.yp.to/djbdns/rbldns.html) should help.
-srs
