Re: SHAKEN/STIR Robocall Summit - July 11 2019 at FCC

["Valdis Klētnieks" <valdis.kletnieks () vt edu>]

On Mon, 08 Jul 2019 17:58:17 -0700, Michael Thomas said:
> On 7/8/19 5:54 PM, Keith Medcalf wrote:

> > This is because DKIM was a solution to a problem that did not exist.
> ::eyeroll:: pray tell, how do you "always" know the identity of the MTA
> sending you a message?

It's more subtle than that - you always know the "identity" of the purported
MTA, because you know their IP address.  Whether "purported" is the same as
"legitimate" or "authorized" is a whole different kettle of fish....

Remember - port 25 is widely blocked precisely because there were always a
plenty supply of MTAs whose identity you knew, sending you spam from consumer
living rooms....

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