what http/https/ftp/smts proxy/relay to use on a network firewall

[tom winter <Omega42@abwesend.de>]

Hi

i'm trying to replace an ISA server used as proxy for incoming 
connections to a web and a mail server with a linux box.
The iptables part is clear, also squid as proxy for client web access... 
but What can be used for layer 3 proxies for server publications?

http proxy should be able to:
termination https connections (use http to internal servers)
handle (s)ftp (maybe a separate component)
link translation (replace internal links from the https servers)
no chaching needed


smtp relay (or proxy) should be able to
deny smtp sessoins for unknown recipients
use blacklists


thanks
tom