From: Victor Duchovni (Victor.Duchovnimorganstanley.com)
Date: Thu Jun 25 2009 - 21:27:30 CDT

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On Thu, Jun 25, 2009 at 09:46:51PM -0400, Sahil Tandon wrote:

> On Thu, 25 Jun 2009, Rob Tanner wrote:
>
> > I?ve got a policy listener in place. It merely logs the request and returns
> > an ?OK? and doesn?t otherwise make any decisions. What I?m noticing is many
> > of the client requests do not even contain the instance attribute. My
> > assumption from reading the documentation was that even a single recipient
> > message would contain an instance attribute with a unique value. Is that
> > incorrect? How do I interpret a request with no instance attribute?
>
> In which phase of the SMTP transaction do you plug in your policy service?
> From what I understand, the instance attribute does not exist until Postfix
> chooses/assigns a queue ID, which happens *after* the first RCPT TO command
> is accepted. If your policy service plugs in before that, there is no
> instance; therefore, the attribute is empty.

IIRC, the instance attribute identifies a mail transaction and is assigned
before the queue-id.

--
        Viktor.

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