Example Python smtplib with STARTTLS negotiation

smtp_example.py

try:
	startT = time.time()
	with SMTP(cfg['smtp_host'], port=cfg['smtp_port']) as smtp:
		smtp.set_debuglevel(2)    # Uncomment this if you wish to see the SMTP conversation / STARTLS neg.
		smtp.ehlo(name='sparkpostSMIME')
		if 'starttls' in smtp.esmtp_features:
			smtp.starttls()         # raises an exception if it fails. If continues, we're good
			smtp.ehlo(name='sparkpostSMIME')
			mode_str = 'STARTTLS'
		else:
			mode_str = 'plain'
		if cfg['smtp_user'] and cfg['smtp_password']:
			smtp.login(cfg['smtp_user'], cfg['smtp_password'])
		print('Opened SMTP connection ({}) to {}, port {}, user="{}", password="{}"'.format(
			mode_str,
			cfg['smtp_host'],
			cfg['smtp_port'],
			cfg['smtp_user'],
			'*' * len(cfg['smtp_password'])))
		print('Sending {}\tFrom: {}\tTo: {} '.format(args.emlfile, msgOut.get('From'), msgOut.get('To')))
		smtp.send_message(msgOut)
		endT = time.time()
		print('OK - in', round(endT - startT, 3), 'seconds')
except SMTPException as e:
	print(e)
	exit(1)