diff --git a/infra/postfix/pw-mta-warmup.sh b/infra/postfix/pw-mta-warmup.sh
index 0245652..53eb42a 100755
--- a/infra/postfix/pw-mta-warmup.sh
+++ b/infra/postfix/pw-mta-warmup.sh
@@ -26,9 +26,16 @@ POSTFIX=/usr/sbin/postfix
 
 # Rotation transports. .90 is Yahoo-dedicated, not in rotation. out02/03/04
 # (.91/.92/.93) were reputation-torched by the May 30-31 over-volume blast and
-# are retired. Warmup starts at fresh out05 (.94).
-ALL=(out05 out06 out07 out08 out09 out10 out11 \
-     out12 out13 out14 out15 out16 out17 out18 out19 out20)
+# are retired.
+#
+# CONSOLIDATED 2026-06-18: the multi-IP snowshoe rotation was built to spread
+# risk while DKIM was broken (fixed 2026-06-17). With DKIM signing correctly,
+# spreading ~3k msgs/day across 12 IPs gave each IP too little per-receiver
+# volume to build reputation -> Gmail/Outlook flagged it as snowshoe spam
+# ("very low reputation of the sending domain"). We now concentrate the entire
+# trucking stream on ONE warm IP (out05 = .94) so it accrues real reputation.
+# To re-expand later, add transports back to ALL and bump the schedule below.
+ALL=(out05)
 
 if [ "${1:-}" = "--start" ]; then
   date +%s | sudo tee "$STATE" >/dev/null