[courses][domains] why own a domain?

[Mary]

On Tue, Jun 08, 2004, Megan Zurawicz wrote:
> On 6/7/04 19:38, mary-linuxchix at puzzling.org shared this thought:
> > Once you own example.com, you are free to choose any @example.com
> > address you like (actually, by custom, a few like abuse at example.com
> > and postmaster at example.com have specific uses, but that's still a
> > lot of freedom!)
> 
> Occasionally I see someone who has only half-a-clue who decides to use
> one of the "daemon addresses" (often, frighteningly enough,
> root at example.com) as their standard email address and to subscribe to
> mailing lists.  A lot of mailing list software will refuse posts from
> daemon addresses, yet another reason why not to use them for
> non-canonical purposes.

Does anyone have any sources (eg RFCs) for which addresses are commonly
reserved?

-Mary