imaps woes

[Toby Batch <toby@io.com>]

i'm new to debian and i'm trying to get imaps running on one of uk2's 
servers.  imap works fine as uw-imap or courier-imap, but i can't seem 
to get a ssl version running.

if i try "apt-get install courier-imap-ssl" i get a message stating:
>>
Reading Package Lists... Done
Building Dependency Tree... Done
Package courier-imap-ssl has no available version, but exists in the 
database.
This typically means that the package was mentioned in a dependency and
never uploaded, has been obsoleted or is not available with the contents
of sources.list
E: Package courier-imap-ssl has no installation candidate
<<

is there a solution to getting imaps running?
i don't really care which package supplies it (uw-imap or courier or 
even another pkg).

if the answer to this is rtfm, then please specify tfm.

Toby.