diff --git a/readthedocs/core/utils/__init__.py b/readthedocs/core/utils/__init__.py
index 363c75ff379..26d9583dca5 100644
--- a/readthedocs/core/utils/__init__.py
+++ b/readthedocs/core/utils/__init__.py
@@ -286,7 +286,7 @@ def send_email_from_object(email: EmailMultiAlternatives | EmailMessage):
                 html_content = content
                 break
     send_email_task.delay(
-        recipient=email.to,
+        recipient=email.to[0],
         subject=email.subject,
         content=email.body,
         content_html=html_content,