diff --git a/.github/workflows/actions.lock b/.github/workflows/actions.lock
index d536b9e..bdc0806 100644
--- a/.github/workflows/actions.lock
+++ b/.github/workflows/actions.lock
@@ -3,30 +3,30 @@
 # Docs: https://gh.io/actions-lockfile
 version: 'v0.0.2'
 workflows:
-    '.github/workflows/governance.yml': []
-    '.github/workflows/label-triage.yml': []
-    '.github/workflows/labels.yml': []
-    '.github/workflows/mirror.yml': []
-    '.github/workflows/scorecard.yml': []
-    '.github/workflows/secret-scanner.yml': []
     '.github/workflows/agda.yml':
         - 'actions/cache@v6.1.0'
         - 'actions/checkout@v7.0.1'
     '.github/workflows/codeql.yml':
         - 'actions/checkout@v7.0.1'
-        - 'github/codeql-action@v4.37.7'
+        - 'github/codeql-action@v4.37.9'
+    '.github/workflows/governance.yml': []
     '.github/workflows/hypatia-scan.yml':
         - 'actions/checkout@v7.0.1'
         - 'actions/github-script@v9.0.0'
         - 'actions/upload-artifact@v7.0.1'
         - 'erlef/setup-beam@v1.24.1'
-        - 'github/codeql-action@v4.37.7'
+        - 'github/codeql-action@v4.37.9'
+    '.github/workflows/label-triage.yml': []
+    '.github/workflows/labels.yml': []
+    '.github/workflows/mirror.yml': []
     '.github/workflows/pages.yml':
         - 'actions/checkout@v7.0.1'
         - 'actions/deploy-pages@v5.0.0'
         - 'actions/upload-pages-artifact@v5.0.0'
     '.github/workflows/push-email-notify.yml':
-        - 'dawidd6/action-send-mail@v3.12.0'
+        - 'hyperpolymath/smtp-notify-action@v0.1.0'
+    '.github/workflows/scorecard.yml': []
+    '.github/workflows/secret-scanner.yml': []
 dependencies:
     'actions/cache@v6.1.0':
         ref: 'v6.1.0'
@@ -65,18 +65,18 @@ dependencies:
         repo_id: 496012378
         uses:
             - 'actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f'
-    'dawidd6/action-send-mail@v3.12.0':
-        ref: 'v3.12.0'
-        commit: 'sha1-94de994a9f6fffee200243214e17002e2920bb59'
-        owner_id: 9713907
-        repo_id: 222439721
     'erlef/setup-beam@v1.24.1':
         ref: 'v1.24.1'
         commit: 'sha1-54075bcc5e249e4758d363f27d099f55d843f124'
         owner_id: 47606891
         repo_id: 331103973
-    'github/codeql-action@v4.37.7':
-        ref: 'v4.37.7'
-        commit: 'sha1-ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd'
+    'github/codeql-action@v4.37.9':
+        ref: 'v4.37.9'
+        commit: 'sha1-cdf488f595d80d6e07e03d4674febd5ab45fa938'
         owner_id: 9919
         repo_id: 259445878
+    'hyperpolymath/smtp-notify-action@v0.1.0':
+        ref: 'v0.1.0'
+        commit: 'sha1-1b3b752d39a4fe4c0f28f10905e4608789d3e050'
+        owner_id: 6759885
+        repo_id: 1352485172
diff --git a/.github/workflows/push-email-notify.yml b/.github/workflows/push-email-notify.yml
index 4ee4d49..ece395b 100644
--- a/.github/workflows/push-email-notify.yml
+++ b/.github/workflows/push-email-notify.yml
@@ -1,13 +1,19 @@
 # SPDX-License-Identifier: MPL-2.0
 # This workflow is managed by gh actions-lock.
-# This workflow is managed by gh actions-lock.
 # Dormant push-email notification. ARMED by setting the repo variable
 # PUSH_EMAIL_ENABLED=true (the single on/off switch). Addresses are pre-filled;
 # sending needs the org SMTP secrets (SMTP_HOST/PORT/USER/PASS). Inherited by
 # new repos from the template; placed on existing repos by the farm sweep.
+#
+# Re-landed after the 2026-07-20 notification-storm freeze (removed in
+# 09f94c5), now on hyperpolymath/smtp-notify-action: Node-free, the SMTP
+# session is Idris2-specified and machine-checked, the binary is Zig-built,
+# byte-reproducible, and SHA-256-pinned inside the action itself.
 name: Push email notification
 on:
-  push: {}
+  push:
+    # Branch pushes only: tag and deletion payloads mislabel Branch:/head_commit.
+    branches: ['**']
 permissions:
   contents: read
 jobs:
@@ -15,9 +21,10 @@ jobs:
     name: Email on push
     if: ${{ vars.PUSH_EMAIL_ENABLED == 'true' }}
     runs-on: ubuntu-latest
+    timeout-minutes: 5
     steps:
       - name: Send push notification email
-        uses: dawidd6/action-send-mail@v18
+        uses: hyperpolymath/smtp-notify-action@v0.1.0 # NOSONAR — pin authority is actions.lock (sha1-1b3b752d39a4fe4c0f28f10905e4608789d3e050)
         with:
           server_address: ${{ secrets.SMTP_HOST }}
           server_port: ${{ secrets.SMTP_PORT }}