Re: increase in spam and what to do about it
- From: bill@xxxxxxxxxxx (Bill Gunshannon)
- Date: 22 Nov 2006 02:07:45 GMT
In article <7d7b6$45639ef8$cef8887a$10159@xxxxxxxxxxxx>,
JF Mezei <jfmezei.spamnot@xxxxxxxxxxxx> writes:
Phillip Helbig---remove CLOTHES to reply wrote:
Has anyone else noticed a large increase in spam in the last few weeks?
http://news.com.com/Tis+the+season+to+send+spam/2100-7349_3-6136901.html?tag=nefd.top
Very interesting article on spam volumes increasing for this christmas season.
The volumes are now up to 819 terabytes of spam per day, compared to 275
per day a year ago.
Researchers found evidence that about 73,000 computers in 166 countries are
part of the SpamThru botnet, adding up to a mighty spam cannon. (This is
some virus which transform an innocent PC in to a member of a centrally
controlled spamming network whene central servers provide templates etc.
I can attest to the "cannon" thing. When spam hits my machine, it is
usually in bursts lasting a few minutes con constant call attempts.
Reducing the number of concurent sessiosn my SMTO server will handle has
reduced the attacks. After two calls, the subquent ones fail until the
first 2 have ended their unsuccesful delivey attempt.
BTW, they often harvest email adresses in a very dumb way which includes
usenet message ids.
Re: RBLs are very efficient.
Here is my smtp.config : ( a few things not available in 5.4 )
$ type $disk4:[sys0.tcpip$smtp]smtp.config
Good-Clients: 10.0.0.0/8
Bad-Clients: 220.144.0.0/16,
200.45.190.0/23
!
! Chinanet
Bad-Clients: 58.0.0.0/8,
59.0.0.0/8,
60.0.0.0/8,
218.66.0.0/15,
220.160.0.0/11,
220.192.0.0/10,
221.0.0.0/8,
222.0.0.0/8,
61.12.0.0/16,
61.206.0.0/16
!
Relay-Zones: vaxination.ca
Relay-Zones: www.vaxination.ca
Relay-Zones: gw.vaxination.ca
!
Reject-Unbacktranslatable-IP: TRUE
Accept-Mail-From: <email address of friends>
SPAM-Action: ACCOUNTING
Security: FRIENDLY
RBLs: combined.njabl.org
RBLs: sbl-xbl.spamhaus.org
Allow-EXPN: NEVER
Allow-VRFY: LOCALLY
Symbiont-Checks-Deliverability: FALSE
Try-A-Records: IFNOMX
!
!
Unbacktranslatable-IP-Text: Can't backtranslate SMTP server's IP
Client-In-RBL-Text: SMTP server is blacklisted in RBL
Bad-Clients-Text: Your network is blocked: sent too much SPAM
Unqualified-Sender-Text: Sender's email address illformed
Unresolvable-Domain-Text: Sender's email domain unresolvable
SPAM-Relay-Text: This facility does not tolerate spammers, relay disabled
EXPN-Used-Text: Environmental regulations forbid the Mining of distribution
lists
VRFY-Used-Text: Spammers are not welcome here
There is a perfect way to get email back under control. Go back to the
old way it was done in the original USENET days (Yes, Email predates the
INTERNET). Setup mail maps again and have email exchanged only between
agreeing hosts. That would immediately eliminate the ability for infected
machines on the INTERNET to send email anywhere. It would eliminate the
need for RBL's as it would take explicit permission to inject email into
the system. People who don't want to play by the rules get shunned. Works
fine for the Amish!!
bill
--
Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three wolves
bill@xxxxxxxxxxxxxxx | and a sheep voting on what's for dinner.
University of Scranton |
Scranton, Pennsylvania | #include <std.disclaimer.h>
.
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