Multiple e-mail Id's in a Vendor Master

Hi experts ,

We have following scenario..

We need to send PO by e-mail to Vendors .

Under one Company code / Plant combination , we have different businesses identified as a Purchase groups.

Same Vendor is supplying to all these Purchase Groups

We will be creating several e-mail addresses which will be applicable per Purchase Group in Vendor Master for the same Vendor ,

When PO is created , based on purchase group , mails should go to different e-mail addresess to the same vendor .

How can this be achieved ?

CAn anyone guide pls?

Thanks ,

Prasad G