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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