[ih] DMARC [was "Father of e-Marketing"]

[Brian E Carpenter]

On 06-Jun-19 12:22, Bernie Cosell wrote:
> On 5 Jun 2019 at 18:32, Chuq Von Rospach wrote:
> 
>> Short answer: there is no engineering effort that will succeed trying
>> to
>> make that happen (*cough* IPv6 *cough*)
> 
> That reminds me: what happened to the IPv4 apocalypse?  Is there a plan, yet, for 
> phasing out IPv4?

The plan is to let it die a natural death. That will take a lot of years. In fact, if the coexistence techniques now in use continue to work, it may be effectively infinite.

    Brian

> 
>> .... you solve nothing, unless your theoretical
>> gateway can magically figure out the bad guys and block them. Which,
>> in
>> practice, is what's already been done with tools like DMARC but
>> backported into butressing SMTP,
> 
> I've gotten confused about this DMARC.  I didn't think it had *anything* to do 
> with blocking bad guys, but little more than protecting the "reputation" of the 
> good guys.  That is, the only thing I can see that it does is prevent the bad guys 
> from "masquerading" as a good guy, but that only leaves about 200 million other 
> source-host-names they can forge to [or with cooperative registries, crank out 
> new, similar-to-real host-sounding host names ad infinitum.   It makes life easier 
> for some of the ISPs that used to look like _they_ were sending spam, but it 
> doesn't seem to affect the spammers.
> 
> And it has the side effect of kinda breaking mailing lists [as we discovered with 
> Vint's email].  Help me understand how DMARC slows down the bad guys.
> 
>   /Bernie\
> 
>             Bernie Cosell
>        bernie at fantasyfarm.com
> -- Too many people; too few sheep --
>    
> 
> 
> 
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