Re: [OT] HELP!!! mail attack

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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


-- 
fedora-list mailing list
fedora-list@xxxxxxxxxx
To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [Fedora Magazine]     [Fedora News]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Maintainers]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Legacy]     [Fedora Desktop]     [Fedora Fonts]     [ATA RAID]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [SSH]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Centos]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Tux]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Asterisk PBX]     [Fedora Sparc]     [Fedora Universal Network Connector]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux