Am Mittwoch, den 26.03.2008, 05:12 -0700 schrieb Craig White: > That account has likely been 'Joe Jobbed' and you are seeing the > backscatter. Google 'Joe Job' or find it on Wikipedia for an > explanation. Great. Seems precisely the problem. > My first 'defense' is greylisting, run as a policy in postfix. The same, I have greylistings activated sometime ago. Works great. Except for bounces, which usually come from real and valid servers. > My second defense is to use rbl's (abuseat / spamhaus / dsbl) to > otherwise block KNOWN blacklisted sources Already activated. > My third defense is to require: > - reverse DNS of sender > - fqdn of sender > - valid hostname > - valid recipient Ok. I will try these. > Once I have accepted e-mail, it is shuffled to 'MailScanner' which is a > wrapper program that sends e-mail through clamav and then through > spamassassin, where it is cleaned and scored. I have the same. The problem is that I received so many mails to that account, until /var/spool/mqueue.in became flooded. > Finally, I have 'sieve' rules for all users which puts high spam score > e-mails into a users 'SPAMBOX' folder of which everything that is older > than 7 days is automatically cleaned out. Thanks a lot, you gave us a lot of lights on how to approach the problem. We are working on finding a pattern to filter the emails, but until now, nothing. You can see the word* files from a lot of messages here (trying to find IPs and so on): http://www.padep.org.bo/log20080325/log/ :) ---------------------------------------------- Rodolfo Alcazar - rodolfo.alcazar@xxxxxxxxxxxx otbits.blogspot.com / counter.li.org: #367962 ---------------------------------------------- "Solange Menschen denken, dass Tiere nicht fühlen; müssen Tiere fühlen, dass Menschen nicht denken." - Unbekannter Autor
