[CentOS] Mail has quit working

Thu Aug 23 20:55:32 UTC 2018
Gordon Messmer <gordon.messmer at gmail.com>

On 08/19/2018 06:21 PM, TE Dukes wrote:
> Another kernel update and things are broken again!
> YEARS with no problems. About tired of messing with this!

Earlier in this thread, you indicated that you saw "warning hostname 
localhost does not resolve to address" in /var/log/maillog, 
and some other logs indicated that postfix was timing out connecting to 
its locally hosted domains.  Both of those suggest that you have DNS or 
network related problems, and not something resulting from package updates.

You might consider posting /etc/resolv.conf, /etc/hosts, 
/etc/sysconfig/network-scripts/ifcfg-<your network interface>, and 
/etc/postfix/main.cfg on https://paste.fedoraproject.org/ for review.  
It would also be useful to see the output of "ip addr show", "ip route 
show", and "ip -6 route show".  If the system starts working suddenly, 
as it did earlier, compare the output of those commands when the system 
is working to the output when it is not.