How to understand the equal sign ‘=’ symbol in IMAP email text?
In a nutshell, an equal sign at the end of a line indicates a soft line break. An equal sign followed by two hexadecimal characters (0-9, A-F) encodes a single octet (byte). This encoding scheme is called “quoted printable” and is defined in section 6.7 of RFC 2045. See items (1) and (5), in particular. … Read more