In my gnus setup I have 1 pop3 account, and 3 imap accounts, but only
one smtp address. How can I have a separate smtp settings so that I am
able to reply via the address of the email that I've just received?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
my git repo = https://bitbucket.org/boudiccas/dots
TGmeds = http://www.tgmeds.org.uk
Debian testing, fluxbox 1.3.5, emacs 24.3.93.1