diff --git a/scripts/bounce-watcher.sh b/scripts/bounce-watcher.sh
index bf25382..2784ccb 100644
--- a/scripts/bounce-watcher.sh
+++ b/scripts/bounce-watcher.sh
@@ -23,8 +23,10 @@ CURRENT_UUID=""
 
 tail -F "$LOG" 2>/dev/null | while IFS= read -r line; do
 
-  # Track queue IDs originating from campaign sender
-  if echo "$line" | grep -q "from=<noreply@performancewest.net>"; then
+  # Track queue IDs originating from campaign sender. Bulk now sends from the
+  # dedicated bulk subdomain (noreply@send.performancewest.net); the root-domain
+  # sender is kept so the pre-cutover queue still drains correctly.
+  if echo "$line" | grep -qE "from=<noreply@send.performancewest.net>|from=<noreply@performancewest.net>"; then
     QID=$(echo "$line" | sed -n 's/.*postfix\/[^[]*\[\([0-9]*\)\]: \([A-Z0-9]*\):.*/\2/p')
     if [ -n "$QID" ]; then
       CAMPAIGN_QIDS[$QID]=1
diff --git a/scripts/build_healthcare_campaigns_cron.py b/scripts/build_healthcare_campaigns_cron.py
index 490138f..8ac3865 100644
--- a/scripts/build_healthcare_campaigns_cron.py
+++ b/scripts/build_healthcare_campaigns_cron.py
@@ -54,8 +54,15 @@ WARMUP_STAMP = "/etc/postfix/hc-warmup-start"
 # re-mails them, regardless of segment or stale CMS data. Append + run --prune.
 SUPPRESS_FILE = os.getenv("HC_SUPPRESS_FILE", os.path.join(STATE_DIR, "hc_suppress.txt"))
 
-FROM_EMAIL = "Performance West Compliance <compliance@performancewest.net>"
-REPLY_TO = "info@performancewest.net"
+# Bulk From — sends from the dedicated bulk subdomain so its sending reputation
+# is isolated from the root domain (which stays clean for transactional /
+# verification mail). Replies still go to the root domain via Reply-To, so the
+# customer-facing reply experience is unchanged. See docs/deliverability.md.
+FROM_EMAIL = os.getenv(
+    "HC_CAMPAIGN_FROM",
+    "Performance West Compliance <compliance@send.performancewest.net>",
+)
+REPLY_TO = os.getenv("HC_CAMPAIGN_REPLY_TO", "info@performancewest.net")
 
 # Segment registry (subject, template file, list/campaign names, row selector)
 # is the single source of truth shared with build_healthcare_campaigns.py.
diff --git a/scripts/build_trucking_campaigns.py b/scripts/build_trucking_campaigns.py
index dc4bbc9..cc6b14c 100644
--- a/scripts/build_trucking_campaigns.py
+++ b/scripts/build_trucking_campaigns.py
@@ -342,6 +342,12 @@ 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}]
 
+# Bulk From — sends from the dedicated bulk subdomain so its sending reputation
+# is isolated from the root domain (which stays clean for transactional /
+# verification mail). Replies still go to the root domain via Reply-To above, so
+# the customer-facing reply experience is unchanged. See docs/deliverability.md.
+FROM_EMAIL = os.getenv("CAMPAIGN_FROM", "Performance West <noreply@send.performancewest.net>")
+
 # Which verification results are safe to SEND to. We key ONLY off
 # email_verify_result, never the email_verified boolean: the verifier sets
 # email_verified=TRUE optimistically for 'mx_unreachable' (domain exists but its
@@ -729,7 +735,7 @@ def create_and_schedule_campaign(
         "name": name,
         "subject": base["subject"],
         "lists": [list_id],
-        "from_email": base["from_email"],
+        "from_email": FROM_EMAIL,
         "type": "regular",
         "content_type": base["content_type"],
         "body": base["body"],
@@ -776,7 +782,7 @@ def send_test(base: dict, campaign_id: int, sample_row: tuple, label: str, tz: s
     list_ids = [l["id"] for l in base.get("lists", []) if isinstance(l, dict)] or [1]
     payload = {
         "name": base.get("name", "Test"), "subject": subj,
-        "lists": list_ids, "from_email": base["from_email"],
+        "lists": list_ids, "from_email": FROM_EMAIL,
         "type": "regular", "content_type": base["content_type"],
         "body": body, "altbody": _altbody_for(base, body),
         "template_id": base["template_id"],
diff --git a/scripts/hc-bounce-watcher.sh b/scripts/hc-bounce-watcher.sh
index 4e99a08..7a62cb8 100644
--- a/scripts/hc-bounce-watcher.sh
+++ b/scripts/hc-bounce-watcher.sh
@@ -17,8 +17,12 @@ TOKEN_FILE=/opt/performancewest/.secrets/hc-listmonk-token
 TOKEN="$(cat "$TOKEN_FILE" 2>/dev/null)"
 AUTHHDR="Authorization: token api:${TOKEN}"
 
-# hc campaign senders
-HC_SENDER1="from=<compliance@performancewest.net>"
+# hc campaign senders. Bulk now sends from the dedicated bulk subdomain
+# (compliance@send.performancewest.net); the root-domain sender is kept so the
+# pre-cutover queue still drains correctly. (Transport-based tracking below also
+# catches everything that egresses an hcout transport, regardless of sender.)
+HC_SENDER1="from=<compliance@send.performancewest.net>"
+HC_SENDER_LEGACY="from=<compliance@performancewest.net>"
 
 get_campaign_uuid() {
   curl -s -H "$AUTHHDR" "$API/api/campaigns?status=running&per_page=1" 2>/dev/null \
@@ -43,7 +47,7 @@ post_bounce() {
 
 tail -F "$LOG" 2>/dev/null | while IFS= read -r line; do
   # Track queue IDs that originate from the hc sender OR go out an hcout transport.
-  if echo "$line" | grep -q "$HC_SENDER1"; then
+  if echo "$line" | grep -qE "$HC_SENDER1|$HC_SENDER_LEGACY"; then
     QID=$(echo "$line" | sed -n 's/.*postfix\/[^[]*\[\([0-9]*\)\]: \([A-Z0-9]*\):.*/\2/p')
     [ -n "$QID" ] && HC_QIDS[$QID]=1
   fi