Mail2Prow.de was shut down because it's now possible to do this directly via prowl api. Please visit Prowlapp.com for more information.
You can now send a Mail to
YOUR-API-KEY @ api.prowlapp.com
e.g. xx5cccaaf4eb0f73f09xffaa1d94458bxx7425a3 @ api.prowlapp.com
You can retrieve your API-Key from here