On 5/1/2013 12:12 AM, Robert Schetterer wrote:
Am 01.05.2013 08:17, schrieb Marc Perkel:
Looking for tricks.
I'm working on improving outbound spam filtering and I'm using Exim and
testing for valid recipients doing forward recipient callouts, which I
would like to reduce.
I'm wondering if there's any tricks to figure out at least some bad
domains or recipients without doing recipient callouts. DNS indicators
that would suggest the recipient is bad.
Or - open to any suggestions on blocking outbound spam. (I'm filtering
outbound for customers so I don't control the original servers)
outbound spam filtering is heavy stuff, beside not to produce false
positives and/or additional support calls, traditional you may have some
border gateway with i.e amavis and kinda quarantaine, but whats really
needed is an outbound anomaly analyser ,in my opinion, we ve done some
concepts about such , but not released anything
after all outbound recipient verfiy will not make you happy as others may
firewall you by doing to much recipient testing, but it may be a way for
limited domains, know to be problematic , analysed by your log before
Best Regards
MfG Robert Schetterer
The idea of outbound verify is that spammers usually have bad lists and
if the email is sending fast and the number of bad recipients is high
that's a good indicator of spam.
--
Marc Perkel - Sales/Support
supp...@junkemailfilter.com
http://www.junkemailfilter.com
Junk Email Filter dot com
415-992-3400
