In <4111D04C(_dot_)7C27(_at_)xyzzy(_dot_)claranet(_dot_)de> Frank Ellermann
<nobody(_at_)xyzzy(_dot_)claranet(_dot_)de> writes:
some purists feel that a site's mail-from scenario may be
different from its PRA scenario
It's a fact, I use From: nobody(_at_)xyzzy with another MSA, and
of course this MSA insists on a MAIL FROM:<me(_at_)msa(_dot_)example>,
but it doesn't insert a Sender:, let alone patch the From:
According to Microsoft, this situation almost never happens. When it
does happen, Microsoft is expecting the MSA to "fix" their system.
Of course, the tiny studies done by Andy Newton and Mark Lentczner
seem to indicate that the PRA has a much higher error rate that
SPF-classic. Microsoft has never backed up their claims that PRA has
a lower error rate than SPF-classic with any data.
Before Sender-Id this MAY was good enough. With Sender-Id
it's a SHOULD on the border to a MUST.
Right.
-wayne