def _addresses(l):
	"""Addresses

	Takes a string or list of strings and returns them formatted for to:, cc:,
	or bcc:

	Arguments:
		l (str|str[]): The address or list of addresses

	Returns:
		str
	"""

	# If we got a list, tuple, or set
	if isinstance(l, (list,tuple,set)):
		return ', '.join(l)
	else:
		return l