> Keep  in mind that known message sources would not be delayed - only
> new,  unknown  sources.  This  amounts  in principle to an automatic
> management  of  QOS  -  giving  some  preference  to traffic that is
> already established.

I  understand  the  idea,  but  I  still  disagree  strongly about its
viability.

> An installation with a low tolerance for delay might set that delay to 2 
> hours or even less. This is often within the range of delays that might 
> normally be experienced due to queue run cycles and so forth...

Not  on systems we manage. If 2 hours were the average delivery delay,
e-mail  would  not  have achieved mission-critical status. Like I said
before,  5-10 minutes can be written off. 2 hours is *always* remarked
upon  by users. With sufficient technical explanation, smoothing over,
or  obfuscation, users can tolerate such *occasional* shocks and still
keep their faith in SMTP. The more often it happens, and especially if
such  delays  are  a *feature*, the less people will use SMTP (or your
services).

>  Some  systems  might  establish  different "quarantine periods" for
> different  groups  of users... for example setting a high quarantine
> period  for  the rank-and file of email addresses - those that would
> almost  exclusively  be receiving mail from already known senders...

"Almost  exclusively" is not "exclusively," and the difference is HUGE
and  deal-killing,  in  my  take. It's not just "publicized" addresses
that receive mail from new, vitally important senders. That's not true
in the real world.

> In  this  context  one might almost make the argument that a message
> from  an  unknown  sender to an unpublished email address has a very
> high  likelihood of being spam on that basis alone...

??? What do you mean by "unpublished," actually?

> If  the  messages  were delivered to a web-readable file of any kind
> then  someone  would presumably need to move them to the appropriate
> location  at  some point...

No,  that  wasn't what I meant. I meant a "purgatory" MBX readable *by
the recipient* that is also managed by a background janitorial process
that either "stamps" a message as legit and moves it to the originally
intended  subarea (not always Main), or "stomps" a message as spam and
deletes  it.  What this would allow is that closely attended mailboxes
will always be able to receive all mail nearly as quickly as currently
possible  (with  the  extra  step of scanning the purgatory mailbox if
over the web; on a POP3 client, the <username-purgatory> mailbox could
be  downloaded  separately  into  the Inbox), while mailboxes that are
unattended  (lunch,  nighttime,  unpermissioned  users) will enjoy the
full benefits of your system.

> As  a  tunable capability this mechanism _might_ be a strong tool to
> have  available for some systems. As with any powerful tool it would
> have to be used carefully.

I  see  it  as  having  the  most  utility  between, say, the hours of
midnight and 6 a.m....hours when lots of legit mail (bulletins and the
like)  comes  in,  accompanied  by lots of spam--yet none of the legit
mail needs to be read until the start of the working day.

-Sandy


------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
e-mail: [EMAIL PROTECTED]
------------------------------------

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