def userQuery():

    global recipients

    user = input("")

    while user != "":
        if user.lower() != "remove" or user.lower() != "removeall":
            recipients.append(user)
            userQuery()

        elif user.lower() == "remove":
            if not recipients:
                print("You haven't added any recipients yet.")
                userQuery()

            else:
                del recipients[-1] # Removes the last item of the list

        elif user.lower() == "removeall":
            if recipients:
                print("Removed every user from the recipient list.")
                recipients = [] # Removes every item from the list
                userQuery()

            else:
                print("Can't delete an empty recipients list.")
                userQuery()


    if user == "":
        if not recipients:
            def checkExit():
                check = input("You haven't added any recipients yet. Would you like to quit? [Y/N]")

                if check.lower() == "y":
                    exit()

                if check.lower() == "n":
                    print("Add users below:\n")
                    userQuery()

            checkExit()

        for recipient in recipients:
            if recipient.lower() == "remove":
                recipients.remove(recipient)

            elif recipient.lower() == "removeall":
                recipients.remove(recipient)

        else:
            print("You have added these users:")

            for recipient in recipients:
                print(recipient)

            print("\n") # Spacing

            def checkMore():
                print("Do you want to add more users? [Y/N]")
                check = input("")

                if check.lower() == "y":
                    userQuery()

                if check.lower() == "n":
                    print("\n") # Spacing
                    subject()

                else:
                    print("Invalid input.")
                    checkMore()

            checkMore()
    print("\n") # Spacing