Dotzero wrote:
Thus, it turns out that if an MTA does mixed MSA and old fashioned port 25
relaying for its clients, its IP cannot convey accountability.
The fact that it cannot (may not?) convey accountability does not mean
that it cannot or should not be held accountable for what it emits.
I understand the 2nd "it" as referring to the MTA, not the IP address.
It doesn't make much difference, since both of them are objects.
AFAICS, the point is to hold _someone_ accountable, so that it might
be theoretically possible to claim damage, in case. It is like an
insurance, and postmasters tend to stipulate it with IP numbers rather
than DNS names. Why?
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