How to send e-mail with excel when date in column equal or smaller than today's date? : I have 3 columns : A) Enterprises B) Email adress matching the enterprise C) Date of reminder

When the date of reminder is smaller or equal than today'S date, I want to automaticaly send a message to the email adress corresponding.

Thank you for advices. 

I havn't wrote any code yet cause i'm new to VBA.