[CentOS] What can I do to UNDERSTAND why I can't reach centos.org (but everyone else can)?

Fri Mar 1 16:43:47 UTC 2013
Les Mikesell <lesmikesell at gmail.com>

On Fri, Mar 1, 2013 at 10:24 AM,  <m.roth at 5-cent.us> wrote:
> Blocking an open relay should be done *only* on human investigation, to
> see whether that's the majority of what's coming out of there, and
> consideration of what the "relay" is, whether it's a known source, or an
> innocent large provider.

The argument on the other side of this is that the blacklist
maintainers don't really block anything, they just make a lookup
service available that corresponds to certain reported or potential
problems.  It is the mail delivery service provider that makes the
decision to reject mail (or not) on behalf of the recipient and no one
forces them to use the blacklists.   If the recipient doesn't want
this, they can use some other mail service or (sometimes) set up
whitelists.   A couple of decades ago I would have agreed that no one
should reject but I think we've learned that you can't trust everyone
with an IP address.

   Les Mikesell
     lesmikesell at gmail.com