On 9/7/2004 5:17 AM +0200, Michael Carmody wrote:
Hey All,
Have a qmailserver with qmail-scanner currently being spammed by several thousand emails a day on a 512/128 ADSL link. The link is being saturated, which was fixed by lowering concurrencyincoming to something ridiculously low.
My problem now is the load is something phenomenal, and I would like to reduce the load on the server by not scanning mail destined for users who do not exist.
The current spam attack is using random usernames and numbers, prepended to the domain.
So can I firstly:
Drop email destined for a non-user before being scanned ? (drop at
smtp negotiate level)
or secondly: Get qmail-scanner to not scan any mail destined for a non-user ?
(check within perl script ?)
Hi Michael,
I'd recommend 2 things: - rblsmtpd (sbl-xbl.spamhaus.org and relays.ordb.org for starters). - recipient check.
RBLs just drop the connection of the connecting ip is matched against a blacklist of known spammers/zombie machines/professional spammers.
Recipient check: checks if the recipient actually exists on your system, before accepting the email. The only problems is the amount/variety of solutions out there (badrcptto/realrcptto/validrcptto) google/qmail.org have them listed.
Also a good page to read would be: http://www.chrishardie.com/tech/qmail/qmail-antispam.html
Kind regards, Niek Baakman -- _______________________________________________________________________ Read about mime: http://www.geoapps.com/nomime.shtml Read about quoting: http://www.netmeister.org/news/learn2quote.html Read about disclaimers: http://www.goldmark.org/jeff/stupid-disclaimers
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