[issue32657] Mutable Objects in SMTP send_message Signature

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

It's probably enough to fix it.  I fear that if we also change them in sendmail we'll break someone's code, but maybe we should do that anyway, for 3.7 only.

----------
versions:  -Python 2.7, Python 3.4, Python 3.5, Python 3.8

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32657>
_______________________________________