diff --git a/infra/postfix/pw-listmonk-rampcap.sh b/infra/postfix/pw-listmonk-rampcap.sh
new file mode 100755
index 0000000..0e441e7
--- /dev/null
+++ b/infra/postfix/pw-listmonk-rampcap.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+# Ramp the Listmonk hourly send cap (sliding window) in lockstep with the
+# Postfix IP warmup, so newly-rotated sending IPs are not blasted.
+#
+# Driven off the SAME warmup start date as pw-mta-warmup
+# (/etc/postfix/pw-warmup-start). Accelerated schedule, justified by historical
+# mail.log data showing these IPs cleanly sustained ~2,500 sends/day at 68-76%
+# delivery once warm; collapses only ever came from 17k-29k spikes.
+#
+# Target STEADY-STATE total daily volume (cap is per-hour; ~daily/10 active hrs):
+#   day 0-1  : ~500/day   -> 50/h
+#   day 2-3  : ~1,500/day -> 150/h
+#   day 4-6  : ~2,500/day -> 250/h
+#   day 7-13 : ~4,000/day -> 400/h  (IPs cleanly sustained 2.5k+ at 68-76%
+#                                    delivery; 0 deferrals/blocks observed)
+#   day 14+  : ~5,000/day -> 500/h  (hard ceiling; never blast past ~17k where
+#                                    historical collapses began)
+set -euo pipefail
+
+STATE=/etc/postfix/pw-warmup-start
+COMPOSE_DIR=/opt/performancewest
+PGPASSWORD=pw_dev_2026
+
+[ -f "$STATE" ] || { echo "no warmup start stamp; run pw-mta-warmup --start first"; exit 1; }
+START=$(cat "$STATE"); NOW=$(date +%s); DAYS=$(( (NOW - START) / 86400 ))
+
+if   [ "$DAYS" -le 1 ];  then RATE=50
+elif [ "$DAYS" -le 3 ];  then RATE=150
+elif [ "$DAYS" -le 6 ];  then RATE=250
+elif [ "$DAYS" -le 13 ]; then RATE=400
+else RATE=500; fi
+
+cd "$COMPOSE_DIR"
+psql() { PGPASSWORD=$PGPASSWORD docker compose exec -T -e PGPASSWORD=$PGPASSWORD api-postgres \
+           psql -U pw -d listmonk -At "$@" 2>/dev/null | grep -v "level=warning" || true; }
+
+CUR=$(psql -c "SELECT value FROM settings WHERE key='app.message_sliding_window_rate';")
+if [ "$CUR" != "$RATE" ]; then
+  psql -c "UPDATE settings SET value='$RATE' WHERE key='app.message_sliding_window_rate';
+           UPDATE settings SET value='\"1h\"' WHERE key='app.message_sliding_window_duration';
+           UPDATE settings SET value='true' WHERE key='app.message_sliding_window';" >/dev/null
+  docker compose restart listmonk >/dev/null 2>&1 || true
+  logger -t pw-rampcap "day $DAYS -> listmonk cap ${RATE}/h (was ${CUR}/h)"
+  echo "$(date "+%F %T") rampcap: day=$DAYS cap=${RATE}/h (changed from ${CUR}/h, listmonk restarted)"
+else
+  echo "$(date "+%F %T") rampcap: day=$DAYS cap=${RATE}/h (no change)"
+fi