A newline is a character sequence that preserves the separation between lines of text. In Python, '\n' represents a newline and can join a list of lines into one multiline string. section 9.3.2
Joining cleaned email lines
After removing unwanted characters from each email line, use '\n'.join(lines) to rebuild the message. Joining with an empty string squishes words together; a space or '*' separates them but does not preserve the original line structure. section 9.3.2
