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2011-05-31 23:08:12

Send on behalf schemes are the main target audience here. Given the
concentration of email recipients on over-the-top providers and the larger
ISPs, being able to unauthenticate and reauthenticate without having to get a
new connection to some very busy systems going can result in significant
savings in latency.

Oh, OK.  Why wouldn't you use the AUTH= parameter on MAIL FROM?

John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
"I dropped the toothpaste", said Tom, crestfallenly.