using different 'From Address" and "From Name"...possible?

I have a friend that wants me to send a newsletter to his clients.  Easy to do since I can setup different mailing lists.  However, we don't want the "From Address" and "From Name" to be coming from my server.  I know I can easily change those settings under the General tab, but doing my own research suggests that ISPs might flag a message as Spam if the headers of the email don't match the actual "From Address" domain.

Any suggestions?  How do other email service companies get around this?

Thanks

Michael