RE: User experience

["Harry Katz" <hkatz@xxxxxxxxxxxxxxxxxxxxxx>]

Greg Connor wrote:

[snip]
> Another point to ponder.  If we decide that there are cases 
> where we want to validate Sender: and we CAN'T validate From: 
> (such as something passed by a list)... would it also be 
> useful to some folks to publish rules like "Always validate 
> From: and do not use Sender: to override?"  This might give 
> PayPal and friends a way to send messages from their "Role account" 
> which should *never* go to a mailing list, and that particular From: 
> address would always be checked, even if we default to 
> checking Sender: 
> most of the rest of the time.
[snip]

Caller ID includes a mechanism for doing exactly this.  Sending
organization include a <directOnly> element in their DNS information
that indicates the domain only sends mail directly to end users and not
through mailing lists.