client/common_lib/mail.py

import os, email.Message, smtplib 


def send(from_address, to_addresses, cc_addresses, subject, message_body):
	"""
	Send out a plain old text email. It uses sendmail by default, but
	if that fails then it falls back to using smtplib.

	Args:
		from_address: the email address to put in the "From:" field
		to_addresses: either a single string or an iterable of
		              strings to put in the "To:" field of the email
		cc_addresses: either a single string of an iterable of
		              strings to put in the "Cc:" field of the email
		subject: the email subject
		message_body: the body of the email. there's no special
		              handling of encoding here, so it's safest to
			      stick to 7-bit ASCII text
	"""
	# addresses can be a tuple or a single string, so make them tuples
	if isinstance(to_addresses, str):
		to_addresses = [to_addresses]
	else:
		to_addresses = list(to_addresses)
	if isinstance(cc_addresses, str):
		cc_addresses = [cc_addresses]
	else:
		cc_addresses = list(cc_addresses)

	message = email.Message.Message()
	message["To"] = ", ".join(to_addresses)
	message["Cc"] = ", ".join(cc_addresses)
	message["From"] = from_address
	message["Subject"] = subject
	message.set_payload(message_body)

	server = smtplib.SMTP("localhost")
	server.sendmail(from_address, to_addresses + cc_addresses, message.as_string())
	server.quit()