The hidden message is:
This was a waste of time to code :P
Explanation:
There is a programming language called Whitespace.
The interesting thing about this language is that the only valid characters are newlines, spaces and tabs. Because of this, it's relatively easy to embed in other text, or even other code.
When I saw the strange indentation/formatting as well as just the strange structure of the text overall, I had a hunch the whitespace was significant. Since the text mentions "coding" a lot, I guessed it might be a programming language. After pasting the entire text into an online interpreter, it produced that hidden message.
Easter egg:
At first glance, it seems that the email is addressed to someone named "Edwin". Line 7 says "Ediwn, I just wanted...". However, line 76 is addressed to "Brady".
This is a reference to the original author of the whitespace programming language, "Edwin Brady".