When a user updates a list, the list appears as it has been updated when the user returns to the list even if the list was not saved. If an email is sent with that list, the email uses the last saved list. This may cause the user to assume the most updated (unsaved) list is being used and changes to constituents are not reflected in the email to the intended recipients, thus some constituents receiving the email that should not receive it and some not receiving the email that should.
It would be helpful for the user to be prompted to save the list after it is updated OR a message to appear prior to sending an email that the list was updated but not saved.