bpo-43124: Fix smtplib multiple CRLF injection (GH-25987)


Co-authored-by: Ɓukasz Langa <lukasz@langa.pl>
(cherry picked from commit 0897253f426068ea6a6fbe0ada01689af9ef1019)

Co-authored-by: Miguel Brito <5544985+miguendes@users.noreply.github.com>
3 files changed