Answer a send's state only to its caller (issue 1261)

modules/mesh-mail/module.json

@@ -6,7 +6,7 @@
     {
       "name": "mail-store",
       "scope": "mesh",
-      "serves": ["accounts", "search", "read", "send"]
+      "serves": ["accounts", "search", "read", "send", "send-status"]
     },
     {
       "name": "mail-webclient",
@@ -24,7 +24,7 @@
     {
       "name": "mail-store",
       "scope": "mesh",
-      "serves": ["accounts", "search", "read", "send"]
+      "serves": ["accounts", "search", "read", "send", "send-status"]
     }
   ],
   "requires": [
@@ -80,7 +80,8 @@
     "mail-store.accounts",
     "mail-store.search",
     "mail-store.read",
-    "mail-store.send"
+    "mail-store.send",
+    "mail-store.send-status"
   ],
   "uses": [
     "operator-channel"