Please make your contacts reporting default to alphbetical order when listing the email names. Even when sorting by last name, first name, etc. does not put them in alpha order.
Any time looking at a report of contacts who have read an email, not read an email, or the contact list in general does not sort and sometimes starts with a random letter - in the last instance it's been the letter C even though there are As & Bs on the list, they appear further down the report and can be intermixed with other letters.
I'd like to repeat that your sorting option does not work.