Re: Sender Address Verification is NOT abouse and very effective

[Loren Wilton]

I don't understand why you think SAV is a louse anti-forgery tool. It 
forces spammers to have to find real email addresses to forge. Domains

Sounds to me like a really exciting development for spammers.  They would 
actually have a way to reliably listwash their lists of invalid addresses, 
and end up with only valid target addresses.

While it may seem that with botnets they have near-infinite sending 
resources, really the sending resources are limited by the overall internet 
bandwidth.  Probably 70% or more of the sent emails are wasted on fake or 
discontinued addresses, and they have no way to know this.  Assuming that 
80% of the internet traffic is spam, 56% of the total internet traffic, and 
70% of the spam traffic, is completely wasted.  If the spammers had reliable 
lists of only the valid recipients, then they could better than double their 
targeted spam delivery rate.  It is the same argument as used for any other 
targeted marketing.

While they don't have to pay for delivery in the same sense as snail-mail 
advertizing, they are bandwidth-limited by the size of the internet.  Until 
others increase the bandwidth for their benefit, they can send only so many 
spams.So being able to send 2-3 times as many targeted spams with good 
addresses with the same bandwidth could only be regarded as good for them.

       Loren