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From "Tellier Benoit (JIRA)" <server-...@james.apache.org>
Subject [jira] [Created] (JAMES-2279) Write a WithPriority mailet and HasPriority matchers
Date Fri, 05 Jan 2018 12:07:00 GMT
Tellier Benoit created JAMES-2279:

             Summary: Write a WithPriority mailet and HasPriority matchers
                 Key: JAMES-2279
                 URL: https://issues.apache.org/jira/browse/JAMES-2279
             Project: James Server
          Issue Type: New Feature
          Components: Mailet Contributions
    Affects Versions: master
            Reporter: Tellier Benoit

James mail queues is handling mail priorities. See the *MailPrioritySupport* interface.

This is done using the MAIL_PRIORITY mail attribute. It is an integer property ranging from
0 (low) to 9 (high) and mail queue component will default to 5.

Today, the mail processing unit akka mailetContainer can not change the priority set by the
SMTP layer (using *MailPriorityHandler*). This is a problem as we can not re-prioritise outgoing
emails, for instance in remote delivery queues.

I would thus propose the following mailet:

<mailet matcher="All" class="WithPriority">

Furthermore, we might want to customize processing logic depending on the priority (might
it just be for debugging purpose).

To do so, I propose to introduce the following matchers:

<mailet matcher="HasPriority=8" class="Any"/>
<mailet matcher="AtLeastPriority=8" class="Any"/>
<mailet matcher="AtMostPriority=8" class="Any"/>

*How to do this?*

In the `server/mailet/mailets` project, in the mailet package create the WithPriority mailet
which sets the MAIL_PRIORITY attribute. 

Create the matchers in  `server/mailet/mailets` in the matcher package.

Write unit tests for these mailets / matchers.

Use MailetUtil content to parse the integer conditions/value.

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