A man’s curiosity has sparked a discussion after he questioned the purpose of a strange barcode, or ‘black and orange streaks’, on his post.

The intrigued individual took to Reddit, querying: “Does anyone know what these markings are on envelopes?” He also shared images for clarity, adding: “I’ve always seen these black and orange streaks on envelopes but never paid them any attention. Today I noticed that there is not a watermark/logo as each one appears to be unique.

“I have attached two…