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Uninstalling a package fails if a class is referenced by an email handler service

Knowledge Article Number 000187081
Description User is trying to uninstall a package. But the uninstall is failing because one of the classes is a EmailHandler class which is being referred by the email service.
Email service using the particular class needs to be deleted first before the package can be uninstalled.
1. Go to Setup > Develop > Email Services.
2. Then click on the Email Service you want to delete, go to its detail page.
3. At the bottom is a section called 'Email Addresses'. If you have addresses set up, delete them.
4. When all of the addresses are removed, a delete button will appear for the service.
5. Delete the service and then you should be able to delete the associated class.

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