adapt Blogger to the new api

Blogger/api/sendmail.lua

@@ -1,6 +1,8 @@
 
 local data = ...
-print(data.content)
+-- print(data.content)
+local error_msg = {}
+local iserror = false
 for k,v in pairs(data.to) do
     print("sent to:"..v)
     local to = v
@@ -11,7 +13,12 @@ for k,v in pairs(data.to) do
     --print(cmd)
     local r = os.execute(cmd)
     if not r then
-        print("Cannot send mail to: "..v)
+        iserror = true
+        table.insert(error_msg, v)
+        print("Unable to send mail to: "..v)
     end
 end
-return "Email sent"
+local result = {}
+result.error = iserror
+result.result = error_msg
+return result