Quoted-printable is an encoding method that uses 7-bit printable ASCII characters. Used to transfer 8-bit data in a 7-bit data path in email.
Quoted-printable represents 8-bit data in 2-digit hexadecimal format, such as =XX. For example, "A" in UTF-8 becomes "=E3=81=82". 7-bit printable characters such as "A" are not converted.