Add bcc option for event emails

src/pretix/control/forms/event.py

@@ -663,6 +663,11 @@ class MailSettingsForm(SettingsForm):
         label=_("Sender address"),
         help_text=_("Sender address for outgoing emails")
     )
+    mail_bcc = forms.EmailField(
+        label=_("Bcc address"),
+        help_text=_("All emails will be sent to this address as a Bcc copy"),
+        required=False
+    )
 
     mail_text_signature = I18nFormField(
         label=_("Signature"),

src/pretix/control/templates/pretixcontrol/event/mail.html

@@ -11,6 +11,7 @@
             {% bootstrap_field form.mail_prefix layout="control" %}
             {% bootstrap_field form.mail_from layout="control" %}
             {% bootstrap_field form.mail_text_signature layout="control" %}
+            {% bootstrap_field form.mail_bcc layout="control" %}
         </fieldset>
         <fieldset>
             <legend>{% trans "E-mail content" %}</legend>