In theory I agree with you completely - but our customers don't have any 
problem with it. In particular, you only have to look for the few moments 
after you complete a purchase online and are EXPECTING an email - no 
different than going to the post office to pick up a package rather than 
waiting for it to be delivered.
this is atrocious human factors.  The whole point behind an antispam 
system is so that you don't have to look at the stuff.
Understood - and the solution here would be to automate it, which of course 
requires some cooperation between all vendors.
again, human factors nightmare.  My mother-in-law (74-year-old lovely 
person) wouldn't be able to cope.  To give you a feel for her level of 
skill, she uses an I-opener Web terminal and is quite comfortable sending 
e-mail and browsing the Web.  She's even getting comfortable google.  In 
contrast she doesn't know how to operate a VCR and is suspicious of remote 
controls.  Telling her she needs to add a special field and have that 
field found by antispam filter whenever she orders something online?  Not 
bloody likely.
I agree with this too - I'm convinced that this is the long term solution.
A stamp model simplifies the entire process because it is done without 
requiring any human interaction.
--- eric
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