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/public/notifications.py

@@ -3,10 +3,12 @@
 import logging
 
 from django.conf import settings
-from django.core.mail import EmailMessage
+from django.core.mail import EmailMultiAlternatives
+from django.template.loader import get_template
 from django.urls import reverse
 
 from leads.models import Lead
+from public.email_branding import email_brand_context
 
 logger = logging.getLogger(__name__)
 
@@ -49,23 +51,25 @@ def notify_admins_of_contact_form(lead: Lead) -> bool:
     ]
     address = "\n".join(bit for bit in address_bits if bit) or "(none)"
 
-    body = (
-        f"New contact form inquiry from {name}.\n\n"
-        f"Name: {name}\n"
-        f"Email: {email}\n"
-        f"Phone: {phone}\n"
-        f"Address:\n{address}\n\n"
-        f"Message:\n{message}\n\n"
-        f"View in portal: {portal_url}\n"
+    ctx = email_brand_context(
+        name=name,
+        email=email,
+        phone=phone,
+        address=address,
+        message=message,
+        portal_url=portal_url,
     )
+    text_content = get_template("emails/contact_email.txt").render(ctx)
+    html_content = get_template("emails/contact_email.html").render(ctx)
 
-    mail = EmailMessage(
+    mail = EmailMultiAlternatives(
         subject=f"New contact form inquiry from {name}",
-        body=body,
+        body=text_content,
         from_email=settings.DEFAULT_FROM_EMAIL,
         to=[to_email],
         reply_to=[contact.email] if contact.email else None,
     )
+    mail.attach_alternative(html_content, "text/html")
     try:
         mail.send(fail_silently=False)
     except Exception: