Field "To" : sending a mail

Dear community,

I want to know how can I add a filter in the field "To" when we are on the Contact's page.

Let's me explain :

I want to have for example only the email address of the Contact who have got the Type : "Supplier".

In my idea I want to have only the email address of the Contact who are defined as a "Supplier"

And not all email addresses

Is somebody know if it's possible?

Thanks a lot.