LearnDash can generate certificates dynamically upon successful completion of all courses in a group, but the certificate can only be viewed online or downloaded to the learners computer. The Send Group 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 all courses within a group. 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 Group Certificates by Email is a global module. When turned on the module will send out a certificate email for any group that has an associated certificate.
Visit the Email Group Certificates knowledge base article for full details.