LearnDash can generate certificates dynamically upon successful completion of a quiz, but the certificate can only be viewed online or downloaded to the learners computer. The Send Quiz Certificate by Email module extends LearnDash functionality by attaching a certificate .pdf to the email that is sent to the learner upon successful completion of a quiz. This module can also send the certificate email to site administrators, group leader(s) or any number of related users.
Please note that the Send Quiz Certificates by Email will send out a certificate email for any quiz that has an associated certificate AND user e-mail notification enabled.
Visit the Email Quiz Certificates knowledge base article for full details.