Mass mailing

Hi,

I need to sent email to some group of people (Smith, Jon etc) (inside my organisation), of course i can create e-mail group and send email to it, but i want this:

Field "To" of this e-mail must be e-mail of each man. For example:

I send email : from XXX@copmany.com to group@copmany.com

This email in outlook of Smith: from XXX@copmany.com to smith@copmany.com

Looks like spam, but inside company.

Can i do this? How?

Thanks.