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Re: SMTP Transferred-By-Reference

2007-11-12 14:28:05
On Mon, 12 Nov 2007 10:48:00 PST, Douglas Otis said:

2. At best, this reduces total bytes over the but the requirement  
for a notification message does not reduce the number of network  
'transactions' -- in fact it increases them by 100% or more.

This calculation is wrong.  You are assuming a substantial percentage  
of messages will be retrieved, yet the typical levels of spam would  
suggest otherwise.

Note that a fairly large percentage of spam is flagged as such by scanning
the *body* of the message - in other words, you don't know if it's spam until
you fetch the data *anyhow*.  What percent of spam are you blocking based
*only* on the SMTP MAIL FROM/RCPT TO data?  That's the percentage you can
avoid fetching the body - and if you're smart you *currently* 4xx/5xx the
transaction before you get to DATA in that case, so you're not saving any
network bandwidth by not fetching it over a second connection.

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