On 12/27/19 4:13 AM, Alessandro Vesely wrote:
If users send out mail using the domain's MTA —as they should
While this would be convenient, I'm not sure it's justified. Sure, it's
easier to do that with modern UAs than it used to be, but I've seen
several UAs that preferred one submission server over others. I've
also seen environments that tried to force outgoing mail to a specific
submission server.
This might be an item for a "best email practices" RFC. But email
usage is incredibly diverse. I suspect we need an alternative way for
users to authenticate their mail than to expect them to submit using
their domain's submission server.
Keith
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