diff --git a/misc/tasks.py b/misc/tasks.py
index 93762c7d74..2c0e517941 100644
--- a/misc/tasks.py
+++ b/misc/tasks.py
@@ -9,6 +9,13 @@
 logger = logging.getLogger(__name__)
 
 
+def add_env_prefix_to_subject(subject: str) -> str:
+    """Add environment prefix to email subject for dev/play environments."""
+    if settings.METACULUS_ENV in ["dev", "play"]:
+        return f"[{settings.METACULUS_ENV}] {subject}"
+    return subject
+
+
 def filter_staff_emails(emails: list[str]) -> list:
     """
     Filters only User.is_staff or *@metaculus.com emails
@@ -28,7 +35,9 @@ def filter_staff_emails(emails: list[str]) -> list:
 
 
 @dramatiq.actor
-def send_email_async(*args, recipient_list: list[str], **kwargs):
+def send_email_async(*args, recipient_list: list[str], subject: str = "", **kwargs):
+    subject = add_env_prefix_to_subject(subject)
+
     recipient_list = (
         recipient_list
         if settings.EMAIL_ALLOW_SEND_TO_ALL_USERS
@@ -36,4 +45,4 @@ def send_email_async(*args, recipient_list: list[str], **kwargs):
     )
 
     if recipient_list:
-        send_mail(*args, recipient_list=recipient_list, **kwargs)
+        send_mail(*args, recipient_list=recipient_list, subject=subject, **kwargs)
diff --git a/misc/views.py b/misc/views.py
index ce428de8c3..c80029a0b7 100644
--- a/misc/views.py
+++ b/misc/views.py
@@ -22,6 +22,7 @@
     SidebarItemSerializer,
 )
 from .services.itn import remove_article
+from .tasks import add_env_prefix_to_subject
 from .utils import get_whitelist_status
 
 
@@ -32,7 +33,7 @@ def contact_api_view(request: Request):
     serializer.is_valid(raise_exception=True)
 
     EmailMessage(
-        subject=serializer.data["subject"] or "Contact Form",
+        subject=add_env_prefix_to_subject(serializer.data["subject"] or "Contact Form"),
         body=serializer.data["message"],
         from_email=settings.EMAIL_SENDER_NO_REPLY,
         to=[settings.EMAIL_FEEDBACK],
@@ -49,7 +50,7 @@ def contact_service_api_view(request: Request):
     serializer.is_valid(raise_exception=True)
 
     EmailMessage(
-        subject="New form submission via Services page",
+        subject=add_env_prefix_to_subject("New form submission via Services page"),
         body=(
             f"Your name: {serializer.data.get('name')}\n"
             f"Email address: {serializer.data['email']}\n"
diff --git a/utils/tasks.py b/utils/tasks.py
index 9be835f77f..f8e2684f40 100644
--- a/utils/tasks.py
+++ b/utils/tasks.py
@@ -3,6 +3,7 @@
 from django.contrib.contenttypes.models import ContentType
 from django.core.mail import EmailMessage
 
+from misc.tasks import add_env_prefix_to_subject
 from questions.types import AggregationMethod
 from utils.dramatiq import task_concurrent_limit
 from utils.translation import (
@@ -59,7 +60,7 @@ def email_all_data_for_questions_task(
         assert data is not None, "No data generated"
 
         email = EmailMessage(
-            subject="Your Metaculus Data",
+            subject=add_env_prefix_to_subject("Your Metaculus Data"),
             body="Attached is your Metaculus data.",
             from_email=settings.EMAIL_SENDER_NO_REPLY,
             to=[email_address],
@@ -69,7 +70,7 @@ def email_all_data_for_questions_task(
 
     except Exception as e:
         email = EmailMessage(
-            subject="Error generating Metaculus data",
+            subject=add_env_prefix_to_subject("Error generating Metaculus data"),
             body="Error generating Metaculus data. Please contact an adminstrator "
             f"for assistance.\nError: {e}",
             from_email=settings.EMAIL_SENDER_NO_REPLY,
@@ -118,7 +119,7 @@ def email_data_task(
         assert data is not None, "No data generated"
 
         email = EmailMessage(
-            subject="Your Metaculus Data",
+            subject=add_env_prefix_to_subject("Your Metaculus Data"),
             body="Attached is your Metaculus data.",
             from_email=settings.EMAIL_SENDER_NO_REPLY,
             to=[user_email],
@@ -128,7 +129,7 @@ def email_data_task(
 
     except Exception as e:
         email = EmailMessage(
-            subject="Error generating Metaculus data",
+            subject=add_env_prefix_to_subject("Error generating Metaculus data"),
             body="Error generating Metaculus data. Please contact an adminstrator "
             f"for assistance.\nError: {e}",
             from_email=settings.EMAIL_SENDER_NO_REPLY,
@@ -153,7 +154,7 @@ def email_user_their_data_task(user_id: int):
         assert data is not None, "No data generated"
 
         email = EmailMessage(
-            subject="Your User Data",
+            subject=add_env_prefix_to_subject("Your User Data"),
             body="Attached is your User Data on Metaculus.",
             from_email=settings.EMAIL_SENDER_NO_REPLY,
             to=[user_email],
@@ -163,7 +164,7 @@ def email_user_their_data_task(user_id: int):
 
     except Exception as e:
         email = EmailMessage(
-            subject="Error generating Metaculus data",
+            subject=add_env_prefix_to_subject("Error generating Metaculus data"),
             body="Error generating Metaculus data. Please contact an adminstrator "
             f"for assistance.\nError: {e}",
             from_email=settings.EMAIL_SENDER_NO_REPLY,