This plugin enables automatic e-mails to the relevant users during the collaboration workflow.
A neat plugin that also works with custom post types.
I'm using both Peter's Post Notes and Peter's Collaboration E-mails and it gave me exactly what I needed to complete my workflow for a multi-author blog. Users are set at contributor level and get all the notifications with the ability to add notes when sending it back to them for review or upon publishing.
A must have when your running a multi author site
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