Feed Validator Results: http://gutschein-universum.com/feed

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This feed does not validate.

Server returned HTTP Error 404: Not Found [help]
line 1, column 0: XML parsing error: <unknown>:1:0: no element found [help]

In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.

Feeds should not be served with the "text/html" media type [help]

Source: http://gutschein-universum.com/feed