Add the option to the emailer plugin to select the event that launches the email
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vote

Multiple configurations (on the same directory) are the recommended way to have different plugin functionality trigger for different events.
You can monitor the same directory multiple times (Right-click → Duplicate for an easy copy), one configuration can include emailing, and another can include just monitoring or any other plugin automation of your choice.
Monitoring the same directory multiple times already offers infinite flexibility in configuration options so there is no need to add this filtering to any of the plugins.