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

Re: [Asrg] Spam detection system proposal

David F. Skoll wrote:

On Wed, 5 Mar 2003, Chris Lewis wrote:



Sorry, wrong.  All bad address removal requires is spamware that
understands SMTP error codes.  No reverse channel of any kind required.





Unless your recipient is running MS Exchange:

http://support.microsoft.com/default.aspx?scid=kb;en-us;304897

or happens to have a Yahoo or AOL account (Yahoo and AOL do not fail
bad addresses at RCPT time.)  I'd imagine this would cover a large
class of spam victims.




But no means all, nor, can we guarantee that they will always be that 
way.  Given evidence of our spamtrap, it appears to be MSN that's the 
only bouncer that "stands out".  Have seen few, if any, AOL blowback in 
our spamtrap.




Most spammers don't care about rejects.  They really don't.





Good!  Then they won't bother cleaning their lists, and my scheme will work.




Except for the difficulty of associating From: x@y, IP: 1.2.3.4 with the 
same spam from a@b, IP: 4.3.2.1.



>> Hell, even some legitimate emailers don't notice rejects and never

>> clean bogus addresses.



> Then this punishes them too -- good.



Iffen you can make the associations (which you can't) it'll still get 
you into trouble.



Case in point: us. Anyone sending, say, a mailing list to our users, 
with a 6 month gap, will see a 40-60% bounce rate. :-(







_______________________________________________

Asrg mailing list

Asrg@ietf.org

https://www1.ietf.org/mailman/listinfo/asrg