Allow to require a verified email to download tickets

src/pretix/base/models/orders.py

@@ -2067,7 +2067,7 @@ class OrderPosition(AbstractPosition):
                   user: User=None, headers: dict=None, sender: str=None, invoices: list=None,
                   auth=None, attach_tickets=False):
         """
-        Sends an email to the user that placed this order. Basically, this method does two things:
+        Sends an email to the attendee. Basically, this method does two things:
 
         * Call ``pretix.base.services.mail.mail`` with useful values for the ``event``, ``locale``, ``recipient`` and
           ``order`` parameters.

src/pretix/base/settings.py

@@ -971,6 +971,19 @@ DEFAULTS = {
                                               'data-checkbox-dependency-visual': 'on'}),
         )
     },
+    'ticket_download_require_validated_email': {
+        'default': 'False',
+        'type': bool,
+        'serializer_class': serializers.BooleanField,
+        'form_class': forms.BooleanField,
+        'form_kwargs': dict(
+            label=_("Do not issue ticket before email address is validated"),
+            help_text=_("If turned on, tickets will not be offered for download directly after purchase. They will "
+                        "be attached to the payment confirmation email (if the file size is not too large), and the "
+                        "customer will be able to download them from the page as soon as they clicked a link in "
+                        "the email. Does not affect orders performed through other sales channels."),
+        )
+    },
     'event_list_availability': {
         'default': 'True',
         'type': bool