install particular version of package

["Lucas Albers" <albersl@cs.montana.edu>]

I would like to install a particular version of sendmail using apt-get
googling says I can do it like such:

apt-get -t testing install sendmail=8.12.10-6

versions are listed here:
http://packages.qa.debian.org/s/sendmail.html

Does the central deb mirror not have multiple versions for download?

I see that it has this:
Accepted sendmail 8.12.10-6 (i386 source all)

How do I install it via apt-get?

I have testing/unstable on my sources.list.

-- 
--Luke CS Sysadmin, Montana State University-Bozeman