> This reminded me of 'greylisting', which I mentioned 
> previously on this
> list:
> 
        http://projects.puremagic.com/greylisting/

The difference is that with greylisting, you keep track of the know good
senders.  So only the first e-mail to/from a particular person coming
through a particular mailserver is delayed.

My concern about implementing greylisting -- which in all other respects
is a very reasonable approach -- is that it breaks the (inaccurate but
widely prevalent) notion that email is an instantaneous medium.  

Further, I'd guess it doesn't deal with VERPs, especially mailing list
VERPs well -- if the envelope sender is new on each piece of email, all
messages will be delayed.



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