diff --git a/scripts/build_trucking_campaigns.py b/scripts/build_trucking_campaigns.py
index 975772a..a2c6bbb 100644
--- a/scripts/build_trucking_campaigns.py
+++ b/scripts/build_trucking_campaigns.py
@@ -554,7 +554,13 @@ TIMEZONE_CONFIG = {
 # Owner email — test sends go here before each campaign is scheduled
 TEST_EMAIL = os.getenv("CAMPAIGN_TEST_EMAIL", "carrierone@gmx.com")
 REPLY_TO_EMAIL = os.getenv("CAMPAIGN_REPLY_TO", "info@performancewest.net")
-REPLY_TO_HEADERS = [{"name": "Reply-To", "value": REPLY_TO_EMAIL}]
+# Listmonk applies campaign headers as `for hdr, val := range set { h.Add(hdr, val) }`
+# (internal/manager/manager.go), i.e. each map's KEY is the literal header name.
+# So the correct shape is {"Reply-To": value}; a {"name": ..., "value": ...} map
+# would emit junk "name:"/"value:" headers and NO real Reply-To, silently sending
+# replies to the From address (noreply@send.performancewest.net) instead. The
+# healthcare builder already uses the correct shape; match it here.
+REPLY_TO_HEADERS = [{"Reply-To": REPLY_TO_EMAIL}]
 
 # Bulk From — sends from the dedicated bulk subdomain so its sending reputation
 # is isolated from the root domain (which stays clean for transactional /
diff --git a/scripts/create_deficiency_source_campaigns.py b/scripts/create_deficiency_source_campaigns.py
index 2f73079..a232d37 100644
--- a/scripts/create_deficiency_source_campaigns.py
+++ b/scripts/create_deficiency_source_campaigns.py
@@ -307,7 +307,7 @@ def update_existing_campaign(campaign_id: int, cfg: dict, body: str, dry: bool)
         "template_id": existing.get("template_id") or TEMPLATE_ID,
         "tags": existing.get("tags") or ["trucking", "deficiency", "source"],
         "messenger": existing.get("messenger") or "email",
-        "headers": existing.get("headers") or [{"name": "Reply-To", "value": REPLY_TO}],
+        "headers": existing.get("headers") or [{"Reply-To": REPLY_TO}],
     }
     if dry:
         print(f"  [{cfg['env']}] DRY-RUN would update source campaign {campaign_id} (body {len(body)} chars)")
@@ -340,7 +340,7 @@ def create_draft(seg_key: str, cfg: dict, dry: bool, update_existing: bool = Fal
         "template_id": TEMPLATE_ID,
         "tags": ["trucking", "deficiency", "source"],
         "messenger": "email",
-        "headers": [{"name": "Reply-To", "value": REPLY_TO}],
+        "headers": [{"Reply-To": REPLY_TO}],
     }
     res = b.lm_api("/campaigns", payload, "POST")
     cid = res["data"]["id"]
diff --git a/scripts/workers/create_compliance_campaign.py b/scripts/workers/create_compliance_campaign.py
index f89637c..aa0f583 100644
--- a/scripts/workers/create_compliance_campaign.py
+++ b/scripts/workers/create_compliance_campaign.py
@@ -251,7 +251,7 @@ def create_campaign():
         "content_type": "html",
         "body": campaign_html,
         "status": "draft",
-        "headers": [{"key": "Reply-To", "value": "info@performancewest.net"}],
+        "headers": [{"Reply-To": "info@performancewest.net"}],
     }, timeout=30)
 
     if not r.ok: