root@mail:~# mailq
-Queue ID-  --Size-- ----Arrival Time---- -Sender/Recipient-------
C9F8BFC224      966 Sun Oct  9 20:00:01  root@merrillpjensen.com
(Host or domain name not found. Name service error for name=merrillpjensen.com type=MX: Host not found, try again)
                                         root@merrillpjensen.com

...
(Host or domain name not found. Name service error for name=merrillpjensen.com type=MX: Host not found, try again)
                                         root@merrillpjensen.com

16ED0FC226      966 Mon Oct 10 20:00:02  root@merrillpjensen.com
(Host or domain name not found. Name service error for name=merrillpjensen.com type=MX: Host not found, try again)
                                         root@merrillpjensen.com

-- 19 Kbytes in 10 Requests.
root@mail:~# 



##</code><code>##

root@mail:~# cat /etc/group
...
mymail:x:1003:sammy,root,wilma,www-data
sammy:x:1004:


##</code><code>##

root@mail:~# cd /home
root@mail:/home# ls
fritz  sammy  wilma
root@mail:/home# cd sammy
root@mail:/home/sammy# ll
total 24
drwxr-x--- 3 sammy sammy  4096 May 18 22:18 ./
drwxr-xr-x 5 root  root   4096 May 16 23:50 ../
-rw-r--r-- 1 sammy sammy   220 Oct  7  2021 .bash_logout
-rw-r--r-- 1 sammy sammy  3771 Oct  7  2021 .bashrc
-rw-r--r-- 1 sammy sammy     0 May 16 22:24 .cloud-locale-test.skip
-rw-r--r-- 1 sammy sammy   807 Oct  7  2021 .profile
drwxrwx--x 2 sammy mymail 4096 May 18 22:18 Maildir/
root@mail:/home/sammy# 


##</code><code>##

root@mail:~# sudo newaliases
root@mail:~# cat /etc/aliases
# See man 5 aliases for format
postmaster:    root

##</code><code>##

root@mail:~# sudo vi /etc/apt/apt.conf.d/50unattended-upgrades
root@mail:~# sudo vi /etc/apt/apt.conf.d/20auto-upgrades
root@mail:~# cat /etc/apt/apt.conf.d/20auto-upgrades
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";
APT::Periodic::Download-Upgradeable-Packages "1";
//APT::Periodic::Verbose "1";
APT::Periodic::AutocleanInterval "7";

root@mail:~# sudo dpkg-reconfigure --priority=low unattended-upgrades
root@mail:~# 

##</code><code>##

root@mail:~# cat /etc/hosts
# Your system has configured 'manage_etc_hosts' as True.
# As a result, if you wish for changes to this file to persist
# then you will need to either
# a.) make changes to the master file in /etc/cloud/templates/hosts.debian.tmpl
# b.) change or remove the value of 'manage_etc_hosts' in
#     /etc/cloud/cloud.cfg or cloud-config from user-data
#
127.0.1.1 fourth fourth
127.0.0.1 localhost
192.168.12.1 mail.merrillpjensen.com mail
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

root@mail:~# 
##</code><code>##

root@mail:~# hostname -d
merrillpjensen.com
root@mail:~# hostname -f
mail.merrillpjensen.com
##</code><code>##

  

root@mail:~# host -t MX mail
mail has no MX record
root@mail:~# host -t MX mail.merrillpjensen.com
Host mail.merrillpjensen.com not found: 2(SERVFAIL)
root@mail:~# host -t MX merrillpjensen.com
Host merrillpjensen.com not found: 2(SERVFAIL)
 host -t MX fourth
;; connection timed out; no servers could be reached

root@mail:~#