Email notification logic needs tuning to determine if change event is due to an "attachment event" - and what kind of action has occured - e.g. new attachment added to issue with existing attachments.

Currently, the email notification wording is not clear - adding a new attachment to an issue with existing attachements reads:

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Updater: Keith Brophy (keith@atlassian.com)
Date: Tue, 29 Jun 2004 9:03 PM
Changes: Attachment changed to screen-shot.jpg
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