Change sender according to recipient

[Equipe R&S Netplus]

Hello,

I would like to change the sender according to the recipient.
Example :
My sender in normal condition is : www-data@myhostname.private
When I send to foo...@foobar.com, I would like to change my sender to
b...@enterprise.com
When I sent to support@enterprise.private, I would like to conserve the
sender identity.

Is it possible ?
Thank you.