Message to the future

There are so many things that only happen once a year - birthdays, start of term, insurance renewals - if only your email system could remember what you did last year, and take care of it next time! Your job is to implement an email server @nextyear, that will interpret the content of any message it receives, work out which things will have to change next year, and then draft an automatic update. It would be safer if this went to the user for checking a few days in advance, and provided a web interface to review currently active processes, but everything should be achieved with the absolute minimum of mouse clicks or wasted user attention