Mail system Configuration issue on UNIX box

Hi, I wanted to configure a mail system on my UNIX box.
For that I read a document Sun Internet Mail Server 3.5 Advanced Installation Guide: Contents which is actually quite useful document but I am not sure from where can I bring patch? Is this patch will come in any CD form which I need to run from CD-ROM or I can download that patch from net by paying money.

I am stopped at the point where they said that you need to run a patch. But from where can I bring patch?

PS: I am having solaris 10 machine.

you need a servicecontract to download patches... and you can find the patch at:

SunSolve Home Page