diff --git a/inventory/Makefile b/inventory/Makefile
new file mode 100644
index 0000000..9dfdbe1
--- /dev/null
+++ b/inventory/Makefile
@@ -0,0 +1,3 @@
+out/eln_extras_mailman3.yaml: inventory.json
+	poi-tracker export-as-content-resolver-input inventory.json out/eln_extras_mailman3.yaml
+
diff --git a/inventory/README.md b/inventory/README.md
new file mode 100644
index 0000000..970d7da
--- /dev/null
+++ b/inventory/README.md
@@ -0,0 +1,7 @@
+# mailman inventory
+
+`inventory.json` is managed using [poi-tracker](https://pagure.io/michel-slm/poi-tracker)
+
+Use the provided `Makefile` to output `eln_extras_mailman3.yaml` for the [ELN Extras](https://docs.fedoraproject.org/en-US/eln/extras/) content resolver.
+
+For convenience, we recommend cloning the [content-resolver-input repo](https://github.com/minimization/content-resolver-input) and symlinking its `configs/eln_extras_mailman3.yaml` to `out/eln_extras_mailman3.yaml` so you can easily put up a PR with any modification.
diff --git a/inventory/inventory.json b/inventory/inventory.json
new file mode 100644
index 0000000..08e1060
--- /dev/null
+++ b/inventory/inventory.json
@@ -0,0 +1,49 @@
+{
+  "name": "Mailman 3 eln-extra packages",
+  "description": "Mailman 3 ELN Extras packages",
+  "maintainer": "ngompa",
+  "labels": [
+    "eln-extras"
+  ],
+  "srpm_packages": [
+    {
+      "name": "python-postorius",
+      "poc": null,
+      "reason": null,
+      "rpm_packages": [
+        {
+          "name": "postorius",
+          "poc": null,
+          "reason": null,
+          "arches": []
+        }
+      ]
+    },
+    {
+      "name": "mailman3",
+      "poc": null,
+      "reason": null,
+      "rpm_packages": [
+        {
+          "name": "mailman3",
+          "poc": null,
+          "reason": null,
+          "arches": []
+        }
+      ]
+    },
+    {
+      "name": "python-hyperkitty",
+      "poc": null,
+      "reason": null,
+      "rpm_packages": [
+        {
+          "name": "hyperkitty",
+          "poc": null,
+          "reason": null,
+          "arches": []
+        }
+      ]
+    }
+  ]
+}
diff --git a/inventory/out/.gitignore b/inventory/out/.gitignore
new file mode 100644
index 0000000..1e82fc7
--- /dev/null
+++ b/inventory/out/.gitignore
@@ -0,0 +1 @@
+*.yaml