By default, SD Elements will send HTML emails for Task Notifications that users are subscribed to. There are two ways to disable this:
Globally Disabling HTML emails
Administrators can add `SEND_ONLY_PLAINTEXT_EMAILS = True` to their `local_settings.py`.
This will disable HTML emails globally-- users cannot re-enable HTML emails on their accounts.
If the administrator has not set `SEND_ONLY_PLAINTEXT_EMAILS = True` in the `local_settings.py`, users can navigate to "Profile Settings" and select the 'I only want plaintext emails.' option.