Re: SPF and bouncing

Long ago, Nostradamus foresaw that on Apr 3, Michael Deutschmann would write:

> On Tue, 3 Apr 2012, Stuart D. Gathman wrote:
>> If you don't accept DSNs, you don't get notified about mistyped
>> addresses.  There is logically no way around that.  If you don't send
>
> You can do what we're (TINW) already doing: use blacklists to terrorize
> every mail admin into verifying mailbox existence in-transaction.  So typo
> notification comes via in-transaction 5xx and not a bounce.

Well, if you still needed proof that alias forwarding is broken, there
you have it.  Those that will not accept SPF end up banning DSNs instead.