On Tue, Mar 04, 2003 at 01:28:24PM -0500, David F. Skoll allegedly wrote:
you'll see that so-called "one-shot" messages make up a large percentage
of the daily message volume -- around 20-25%.
By the way, tempfailing senders the first time (or better yet,
tempfailing on the basis of sender-recipient pairs) is a solution that
fits transparently[*] into the existing e-mail infrastructure, uses
very few resources, and is quite effective. I highly recommend it.
How do you differentiate between list-washing and spam delivery attempts? It's
an anecdote, but about half of the email to invalid sender-recipient pairs I
see appears to be testing addresses (in alphabetically order no less) without
issuing a DATA command.
If you issue the deferral before the DATA phase, then your 20-25% needs
to consider the list-washers/address testers.
Nonetheless, very interesting data.
Regards.
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