I have a list of emails and I would like to sorted that list by domains E.g. If the list is Emails=['a at hotmail.com','a at yahoo.com','b at hotmail.com','c at yahoo.com',....] after sorting I would like to have Emails=['a at hotmail.com','b at hotmail.com','a at yahoo.com','c at yahoo.com',....] What is the best/easiest way? Thank you for help L.