multiple smtp servers?

["Michael A. Peters" <mpeters mac com>]

Life is not quite as simple as it use to be - I now need to use  
multiple smtp servers.

I can't use an smtp server on my local machine because some people I  
need to contact, their servers (I guess to fight spam/viruses) reject  
my e-mails if the e-mail looks spoofed/relayed - but accept it if it  
comes through from the smtp server the pop account is associated with.

Balsa (I'm using 2.2.5) seems to only allow me to configure one smtp  
server, so depending upon which account the mail is to, I have to  
change the smtp server when I reply.

Is there a solution in balsa for this?
If not, is there any hackery/tricery with postfix to have it pretend it  
is a mail client and log onto the various smtp servers to send the  
message dependent upon the from address?

Thanks for suggestions.

running balsa 2.2.5 on Fedora Core 3 (I'll upgrade to latest 2.3 balsa  
when fc4 is released)

--
Michael A. Peters
http://mpeters.us/