command button to send email

Hey everyone. I have a problem. I need to add an emailing function to my excel spreadsheet. I have people listed that are in charge of certain files. I need a macro that will send them a message every x amount of days reminding them that I need an updated version of the file. Or atleast I need to get a macro that i can press a button and an email will be sent to that person that is responsible for the file update. How do I do this? all help is appreciated.