[Asrg] Email Postage (was Re: FeedBack loops)

[David Wall]

> I suspect that the majority of email sent has three of those four 
> implemented. If not quite a majority it's _definitely_ a large fraction.
>
> (Yes, I'm cheating. Nobody other than the very, very gullible 
> implements SenderID as such, but a valid SPF record is also a valid 
> SenderID record).

Since spam is said to be 90%, 95%, 99% of all email, but you say most is 
sent with sender id.  Are you suggesting most spam is sent with valid 
sender id?  Don't think so.

Having an SPF record is not the same as implementing SPF unless you 
block all email that arrives that is not authenticated through SPF.  You 
are just posting a sign saying you'd like to comply, but don't actually 
implement it on the receiving end.  And if you block everything that 
doesn't have SPF configured, you'll lost much of your legit email.

David