Gunnar Hjalmarsson wrote:
Frank Ellermann wrote:
[[ When I said "probably not" the same as Stuart's idea I
meant "probably yes", sorry, not enough coffee + PEBKAC ]]
it's the broken C/R system's fault; the challenge should have
been sent with an empty envelope FROM.
RfC 3834 says only MAY. It's fun to read RfC 3834, check it
out. A C/R system could use an empty or non-empty MAIL FROM -
of course the latter should not create another challenge - and
a header field Auto-Submitted:
One of my favourite RfCs, although the author is not exactly
pleased with my theory that it works best behind a SPF check.
Bye, Frank