When running a document package with Email Delivery Option the  User is encountering the following error:

Single email is not enabled for your organization or profile. (ExternalError)
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1. The access level might have been set to 'system emails.' > Set to All emails.

In Salesforce Classic: Setup | Administer | Email Administration | Deliverability, verify access level is set to 'All emails'

In Lightning Experience: Gear icon | Setup | ADMINISTRATION | Email | Deliverability, verify access level is set to 'All emails'

** See additional Salesforce information in the Links Section.**

Salesforce Documentation: https://help.salesforce.com/articleView?id=000322724&language=en_US&type=1&mode=1