gmail-inbox | Receive gmail emails in code | Email library

You have everything in place. Just have to understand a few concepts.

"email" library allows you to convert typical email bytes into an easily usable object called Message using its parser APIs, such as message_from_bytes(), message_from_string(), etc.

The typical error is due to an input error.

email.message_from_bytes(data[0][1].decode())

The function above, message_from_bytes, takes bytes as an input not str. So, it is redundant to decode data[0][1] and also inputting through the parser API.

In short, you are trying to parse the original email message twice using message_from_bytes(data[0][1]) and message_from_string(email_message_raw). Get rid of one of them and you will be all set!

Try this approach: