noise.py: support SMTP-SSL, field SMTP_SENDER
noise.py: support SMTP-SSL, field SMTP_SENDER

Many mails servers do not support unencrypted SMTP.
SMTP_SSL is provided as switch.

Some mail servers do not allow to provide an arbitrary address
for 'MAIL FROM:'. Field SMTP_SENDER is used to set this field.

Signed-off-by: Heinrich Schuchardt <2cd7bb605d542f55cc27b85da62ad2c96ce31039@gmx.de>

relayr/python-sdk,relayr/python-sdk,relayr/python-sdk