If your FM application is currently hosted in FM server, then you can do this easily. You can write an FM script wchich as per your requirement to send the email. Then open your FM server admin console. Go to scripts section, choose your database and that script and set the script to run daily with a suitable time. That's it and now your script will run on daily basis to send the mail to repsective email address.
Dillip's method is definitely one to to use if it fits your current system setup. But it's not the only option.
If that suggestion does not work for your setup, feel free to describe your set up in a bit more detail. WHEN you want the system do such a check is a key question to answer when evaluating your options. A server scheduled script is a good option if you have Filemaker Server, but there are also other ways to schedule a regular check for this if you do not use FileMaker server.