Send branded HTML emails and harden SMTP2GO webhooks.

Fix campaign stuck on sending under async queue, and stop UUID ValidationError when SMTP2GO tests send "Headers Unavailable".

site/messaging/tasks.py

@@ -3,11 +3,12 @@ from django.utils import timezone
 
 from messaging.channels import dispatch_message
 from messaging.models import Message
-from messaging.services import contact_may_receive
+from messaging.services import contact_may_receive, refresh_campaign_status
 
 
 @task
 def send_campaign_message(message_id: str) -> None:
+    campaign = None
     try:
         message = Message.objects.select_related("contact", "campaign").get(
             pk=message_id
@@ -15,10 +16,13 @@ def send_campaign_message(message_id: str) -> None:
     except Message.DoesNotExist:
         return
 
+    campaign = message.campaign
+
     if not contact_may_receive(message.contact, message.channel):
         message.status = Message.Status.SUPPRESSED
         message.error = "Contact opted out or suppressed"
         message.save(update_fields=["status", "error", "updated_at"])
+        refresh_campaign_status(campaign)
         return
 
     try:
@@ -42,4 +46,7 @@ def send_campaign_message(message_id: str) -> None:
         message.status = Message.Status.FAILED
         message.error = str(exc)[:2000]
         message.save(update_fields=["status", "error", "updated_at"])
+        refresh_campaign_status(campaign)
         raise
+
+    refresh_campaign_status(campaign)