diff --git a/README.md b/README.md
index e8b733c..d269023 100644
--- a/README.md
+++ b/README.md
@@ -2713,7 +2713,30 @@ the corresponding index is made available as JSON:
   },
   "idx": 1,
   "isMultipart": true,
-  "receivedAt": "2024-07-02T11:23:31.212523916+02:00",
+  "multiparts": [
+    {
+      "bodySize": 15,
+      "headers": {
+        "Content-Type": [
+          "text/plain; charset=utf-8"
+        ]
+      },
+      "idx": 0,
+      "isMultipart": false
+    },
+    {
+      "bodySize": 39,
+      "headers": {
+        "Content-Type": [
+          "text/html; charset=utf-8"
+        ]
+      },
+      "idx": 1,
+      "isMultipart": false
+    }
+  ],
+  "multipartsCount": 2,
+  "receivedAt": "2024-07-02T11:44:32.767921301+02:00",
   "smtpFrom": "testsender2@programmfabrik.de",
   "smtpRcptTo": [
     "testreceiver2@programmfabrik.de"
@@ -2745,7 +2768,6 @@ following schema:
 
 ```json
 {
-  "count": 2,
   "multiparts": [
     {
       "bodySize": 15,
@@ -2754,6 +2776,7 @@ following schema:
           "text/plain; charset=utf-8"
         ]
       },
+      "idx": 0,
       "isMultipart": false
     },
     {
@@ -2763,9 +2786,11 @@ following schema:
           "text/html; charset=utf-8"
         ]
       },
+      "idx": 1,
       "isMultipart": false
     }
-  ]
+  ],
+  "multipartsCount": 2
 }
 ```
 
diff --git a/internal/smtp/http.go b/internal/smtp/http.go
index 0c37777..95b3c4f 100644
--- a/internal/smtp/http.go
+++ b/internal/smtp/http.go
@@ -223,33 +223,13 @@ func (h *smtpHTTPHandler) handleMultipartIndex(w http.ResponseWriter, r *http.Re
 		multiparts = SearchByHeader(multiparts, headerSearchRgx)
 	}
 
-	multipartsOut := make([]any, 0)
-
-	for _, part := range multiparts {
-		multipartsOut = append(multipartsOut, buildContentMeta(part.Content()))
-	}
-
-	out := make(map[string]any)
-	out["count"] = len(multiparts)
-	out["multiparts"] = multipartsOut
-
-	handlerutil.RespondWithJSON(w, http.StatusOK, out)
+	handlerutil.RespondWithJSON(w, http.StatusOK, buildMultipartIndex(multiparts))
 }
 
 func (h *smtpHTTPHandler) handleMultipartMeta(
 	w http.ResponseWriter, r *http.Request, part *ReceivedPart,
 ) {
-	out := map[string]any{
-		"idx": part.Index(),
-	}
-
-	contentMeta := buildContentMeta(part.Content())
-
-	for k, v := range contentMeta {
-		out[k] = v
-	}
-
-	handlerutil.RespondWithJSON(w, http.StatusOK, out)
+	handlerutil.RespondWithJSON(w, http.StatusOK, buildMultipartMeta(part))
 }
 
 func buildContentMeta(c *ReceivedContent) map[string]any {
@@ -264,6 +244,13 @@ func buildContentMeta(c *ReceivedContent) map[string]any {
 	}
 	out["headers"] = headers
 
+	if c.IsMultipart() {
+		multipartIndex := buildMultipartIndex(c.Multiparts())
+		for k, v := range multipartIndex {
+			out[k] = v
+		}
+	}
+
 	return out
 }
 
@@ -296,6 +283,34 @@ func buildMessageBasicMeta(msg *ReceivedMessage) map[string]any {
 	return out
 }
 
+func buildMultipartIndex(parts []*ReceivedPart) map[string]any {
+	multipartsOut := make([]any, len(parts))
+
+	for i, part := range parts {
+		multipartsOut[i] = buildMultipartMeta(part)
+	}
+
+	out := make(map[string]any)
+	out["multipartsCount"] = len(parts)
+	out["multiparts"] = multipartsOut
+
+	return out
+}
+
+func buildMultipartMeta(part *ReceivedPart) map[string]any {
+	out := map[string]any{
+		"idx": part.Index(),
+	}
+
+	contentMeta := buildContentMeta(part.Content())
+
+	for k, v := range contentMeta {
+		out[k] = v
+	}
+
+	return out
+}
+
 // extractSearchRegex tries to extract a regular expression from the referenced
 // query parameter. If no query parameter is given and otherwise no error has
 // occurred, this function returns (nil, nil).