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NO_MASS_MAIL_PERMISSION, Single email is not enabled for your organization or profile

Symptoms

Error:
Sending e-mail with new comment failed: SendEmail failed. First exception on row 0; first error: NO_MASS_MAIL_PERMISSION, Single email is not enabled for your organization or profile. Single email must be enabled for you to use this feature.: []

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Solutions

By default, Salesforce disables mail delivery in sandboxes to prevent unintended emails from being sent. In order to send email in a sandbox, the Access Level must be changed to All Email.

Navigate to Setup > Email Administration > Deliverability to update the Access Level to All Email.
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Status

This behavior is by design.

Email to Case Premium will display a warning in the Setup Wizard and Settings pages to alert administrators when the Access Level will prevent emails from being sent.

Additional Information

Support

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