diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index 0f48b94a..106ac67b 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -690,8 +690,7 @@ class DraftMessageView(APIView):
         - parentId: str (optional, message id if reply, None if first message)
         - senderId: str (mailbox id of the sender)
         - subject: str
-        - htmlBody: str (optional)
-        - textBody: str (optional)
+        - draftBody: str (optional)
         - to: list[str] (optional)
         - cc: list[str] (optional)
         - bcc: list[str] (optional)
@@ -699,8 +698,7 @@ class DraftMessageView(APIView):
         
     PUT /api/v1.0/draft/{message_id}/ with expected data:
         - subject: str (optional)
-        - htmlBody: str (optional)
-        - textBody: str (optional)
+        - draftBody: str (optional)
         - to: list[str] (optional)
         - cc: list[str] (optional)
         - bcc: list[str] (optional)
@@ -995,6 +993,10 @@ class SendMessageView(APIView):
     POST /api/v1.0/send/ with expected data:
         - messageId: str (ID of the draft message to send)
         - senderId: str (ID of the mailbox to use as sender)
+        - draftBody: str (optional)
+        - to: list[str] (optional)
+        - cc: list[str] (optional)
+        - bcc: list[str] (optional)
         Return the sent message
     """
 
diff --git a/src/backend/core/migrations/0005_message_draft_body.py b/src/backend/core/migrations/0005_message_draft_body.py
new file mode 100644
index 00000000..b2eb3c8b
--- /dev/null
+++ b/src/backend/core/migrations/0005_message_draft_body.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.1.8 on 2025-04-28 02:44
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0004_message_is_draft'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='message',
+            name='draft_body',
+            field=models.TextField(blank=True, verbose_name='draft body'),
+        ),
+    ]
diff --git a/src/backend/core/models.py b/src/backend/core/models.py
index 9668bcf5..24b57f25 100644
--- a/src/backend/core/models.py
+++ b/src/backend/core/models.py
@@ -368,6 +368,8 @@ class Message(BaseModel):
     # to object storage in the future.
     raw_mime = models.BinaryField(blank=True, default=b"")
 
+    draft_body = models.TextField(_("draft body"), blank=True)
+
     # Internal cache for parsed data
     _parsed_email_cache: Optional[Dict[str, Any]] = None