debian postfix and 3rd party repo

[Mihamina Rakotomandimby <mihamina@gulfsat.mg>]

Manao ahoana, Hello, Bonjour,

I have to use the "postfix" package from this repository:

  deb http://debian.home-dn.net/lenny postfix-vda/

But the package name (postfix) is the same.
That means if I have official Debian reposotories _and_ that one
enabled, what is the expected behaviour of apt if I perform a
 
  "apt-get install postfix" ?

I suppose I have to use apt pinning, but as far as I know, apt pinning
is between different debian releases, how to pin between these
repositories for postfix?

Misaotra, Thanks, Merci.

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