postfix-tls

[rawe]

Hi,
again the question about postfix-tls, because there is no answer in this forum.
When it says "postfix-tls has no installation candidate", what does it mean? I´ve been locking around for days now and been reading a hell lot of bullshit, just saying nothing, exept what kind of great Admin somebody is.- But maybe somebody here can give me a wink.
I just want to know what the sentence "postfix-tls has no installation candidate" simply means and how I can work around it.

thanks for your help

rawe
www:/usr/local/src/ispcp/ispcp-omega-1.0.0# apt-get install $(cat ./docs/Debian/debian-packages-etch)
Reading package lists... Done
Building dependency tree... Done
bash is already the newest version.
bzip2 is already the newest version.
diff is already the newest version.
gzip is already the newest version.
iptables is already the newest version.
libsasl2 is already the newest version.
locales is already the newest version.
lsb-base is already the newest version.
perl-base is already the newest version.
Package postfix-tls is a virtual package provided by:
postfix 2.3.8-2+etch1
You should explicitly select one to install.
E: Package postfix-tls has no installation candidate