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/email_branding.py

@@ -0,0 +1,60 @@
+"""Shared context for branded HTML/text emails (public site palette)."""
+
+from __future__ import annotations
+
+import html
+import re
+
+from django.conf import settings
+from django.contrib.staticfiles.storage import staticfiles_storage
+
+
+_URL_RE = re.compile(r"(https?://[^\s<]+)")
+
+
+def email_brand_context(**extra):
+    site_url = (getattr(settings, "PUBLIC_SITE_URL", None) or "").rstrip("/")
+    if not site_url:
+        site_url = "https://mkdrealtor.com"
+
+    logo_path = staticfiles_storage.url("brand/exit_logo.png")
+    if logo_path.startswith("http://") or logo_path.startswith("https://"):
+        logo_url = logo_path
+    else:
+        logo_url = f"{site_url}{logo_path}"
+
+    brand_name = getattr(settings, "SITE_NAME", None) or "Monica Dhillon"
+    brand_legal = getattr(settings, "CREDIT_NAME", None) or brand_name
+    tagline = getattr(settings, "SITE_TAGLINE", None) or ""
+    host_label = site_url.replace("https://", "").replace("http://", "")
+
+    return {
+        "site_url": site_url,
+        "logo_url": logo_url,
+        "brand_name": brand_name,
+        "brand_legal": brand_legal,
+        "brand_tagline": tagline,
+        "host_label": host_label,
+        **extra,
+    }
+
+
+def plain_text_to_email_html(text: str) -> str:
+    """Escape plain text and turn paragraphs / URLs into simple HTML."""
+    raw = (text or "").replace("\r\n", "\n").strip()
+    if not raw:
+        return ""
+
+    blocks: list[str] = []
+    for para in re.split(r"\n\s*\n", raw):
+        lines = [html.escape(line) for line in para.split("\n")]
+        joined = "<br>\n".join(lines)
+        joined = _URL_RE.sub(
+            r'<a href="\1" style="color:#00626c;text-decoration:underline;">\1</a>',
+            joined,
+        )
+        blocks.append(
+            f'<p style="margin:0 0 16px;color:#212121;font-size:15px;'
+            f'line-height:1.6;">{joined}</p>'
+        )
+    return "\n".join(blocks)