On Wed, 2 Feb 2005, The Purple Streak, Hilarie Orman wrote:
For the SMTP queues, it had seemed an interesting possibility to have
the callout server maintain the queues. That's a radical change to
the normal SMTP implementation, admittedly, and it might not make
sense from the perspective of I/O efficiency. But it would facilitate
a very lean SMTP implementation.
Existing callout protocols try to avoid any queueing in the policy server.
Postfix has support for a pre-reception SMTP proxy, effectively mode 1 but
implemented like mode 4.
http://www.postfix.org/SMTPD_PROXY_README.html
It also has a simpler policy protocol, which is more like an OPES mode 1
callout protocol.
http://www.postfix.org/SMTPD_POLICY_README.html
The Sendmail milter protocol is another mode 1 example, but it's defined
by its implementation rather than in an open fashion.
http://www.milter.org/milter_api/
Tony.
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