diff --git a/RIGS/management/commands/send_reminders.py b/RIGS/management/commands/send_reminders.py
index 4f38d734..9157c694 100644
--- a/RIGS/management/commands/send_reminders.py
+++ b/RIGS/management/commands/send_reminders.py
@@ -13,6 +13,7 @@ from RIGS import models
 
 
 class Command(BaseCommand):
+    # FIXME This needs a different implementation when moved off heroku
     help = 'Sends email reminders as required. Triggered daily through heroku-scheduler in production.'
 
     def handle(self, *args, **options):
@@ -33,6 +34,6 @@ class Command(BaseCommand):
                     reply_to=[f"h.s.manager@{settings.DOMAIN}"],
                 )
                 css = finders.find('css/email.css')
-                html = premailer.Premailer(get_template("email/ra_reminder.html").render(context), external_styles=css).transform()
+                html = premailer.Premailer(get_template("email/ra_reminder.html").render(context), external_styles=css, allow_loading_external_files=True).transform()
                 msg.attach_alternative(html, 'text/html')
                 msg.send()
diff --git a/RIGS/signals.py b/RIGS/signals.py
index e3642838..ca0f949b 100644
--- a/RIGS/signals.py
+++ b/RIGS/signals.py
@@ -66,7 +66,7 @@ def send_eventauthorisation_success_email(instance):
 
     css = finders.find('css/email.css')
     html = Premailer(get_template("email/eventauthorisation_client_success.html").render(context),
-                     external_styles=css).transform()
+                     external_styles=css, allow_loading_external_files=True).transform()
     client_email.attach_alternative(html, 'text/html')
 
     escapedEventName = re.sub(r'[^a-zA-Z0-9 \n\.]', '', instance.event.name)
@@ -124,7 +124,7 @@ def send_admin_awaiting_approval_email(user, request, **kwargs):
             )
             css = finders.find('css/email.css')
             html = Premailer(get_template("email/admin_awaiting_approval.html").render(context),
-                             external_styles=css).transform()
+                             external_styles=css, allow_loading_external_files=True).transform()
             email.attach_alternative(html, 'text/html')
             email.send()
 
diff --git a/RIGS/views/rigboard.py b/RIGS/views/rigboard.py
index 1c0daea6..ea4b4d73 100644
--- a/RIGS/views/rigboard.py
+++ b/RIGS/views/rigboard.py
@@ -360,7 +360,7 @@ class EventAuthorisationRequest(generic.FormView, generic.detail.SingleObjectMix
         )
         css = finders.find('css/email.css')
         html = premailer.Premailer(get_template("email/eventauthorisation_client_request.html").render(context),
-                                   external_styles=css).transform()
+                                   external_styles=css, allow_loading_external_files=True).transform()
         msg.attach_alternative(html, 'text/html')
 
         msg.send()
@@ -376,7 +376,7 @@ class EventAuthoriseRequestEmailPreview(generic.DetailView):
         css = finders.find('css/email.css')
         response = super().render_to_response(context, **response_kwargs)
         assert isinstance(response, HttpResponse)
-        response.content = premailer.Premailer(response.rendered_content, external_styles=css).transform()
+        response.content = premailer.Premailer(response.rendered_content, external_styles=css, allow_loading_external_files=True).transform()
         return response
 
     def get_context_data(self, **kwargs):