need to know this
 

How should i find up to date information on and/or software for named;security problems in computer systems;the standard Unix mail transport software.

Well, Google is always a good start. So's The Linux Documentation Project.

And never forget the man pages.

How should i find up to date information on and/or software for named;
Your distro's site, mailinglist, update mechanism or the authors site. Note some people prefer and promote Dan Bernsteins' software over ISC's BIND.


security problems in computer systems;
The LQ FAQ: Security references, sites and mailinglists. Check out Linuxsecurity, Securityfocus, SANS, CERT, etc etc.


the standard Unix mail transport software.
What Rose_bud4201 said.