If your host allows it, you could set up a cron job to run a script. For example you could create a page using UE to send an email 365 days after the start of membership date in the database. Have it run on page load as the trigger. Then set the cron job to run everyday and point it to that script page. Very simplistic answer but it depends if you have access to crons. If you have cPanel then you probably can.