def lookahead(iterable): # https://stackoverflow.com/a/1630350
	"""Pass through all values from the given iterable, augmented by the
	information if there are more values to come after the current one
	(True), or if it is the last value (False).
	"""
	# Get an iterator and pull the first value.
	it = iter(iterable)
	try:
	    last = next(it)
	except StopIteration:
	    return
	# Run the iterator to exhaustion (starting from the second value).
	for val in it:
	    # Report the *previous* value (more to come).
	    yield last, False
	    last = val
	# Report the last value.
	yield last, True

def email2html(mailtext:str,extraclasses=""):
	#print(mailtext)
	from html import escape
	res='<section class="email %s"><p>'%extraclasses
	mail=escape(mailtext).replace("\n\n","</p><p>").replace("\n","<br>")
	res+=mail
	res+="</p></section>"
	return res