EMails mit Python an mehrere Empfänger versenden

	...
	sender = "sender@mail.de"  
	to = [""]  
	cc = [""]  
	bcc = ["empfaenger1@gmail.com", "empfaenger2@web.de"]  
	
	assert type(to) == list
	assert type(cc) == list
	assert type(bcc) == list
	
	mail = MIMEMultipart()
	mail['From'] = sender  
	mail['To'] = COMMASPACE.join(to)  
	mail['Cc'] = COMMASPACE.join(cc)  
	mail['Bcc'] = COMMASPACE.join(bcc)  
	
	addresses = 
	for x in to:
		addresses.append(x)
	
	for x in cc:
		addresses.append(x)
	
	for x in bcc:
		addresses.append(x)

	# Mailinhalt
	mail['Subject'] = "test"  
	body = "Das ist eine Pyhton-Testmail"  
	mail.attach(MIMEText(body, 'plain'))  
	
	# E-Mail versenden
	try:
		smtpserver.sendmail(sender, addresses, mail.as_string())
		print("E-Mail wurde erfolgreich verschickt")  
		smtpserver.close()
	...