Local host name is not qualified

After updating /etc/aliases on a CentOS 7 system that uses sendmail for transmitting email by adding a new alias, I ran newalises. When I did so, it took a fair amount of time for the command to complete and when it did I saw the error message below:

[root@moonpoint ~]# newaliases
WARNING: local host name (moonpoint) is not qualified; see cf/README: WHO AM I?
/etc/aliases: 360 aliases, longest 69 bytes, 6301 bytes total
[root@moonpoint ~]#

The referenced "cf/README" file is at /usr/share/sendmail-cf/README .

I had also noticed that when I entered the mailq command to see what messages were queued for transmission it took a long time to see the results. And whenever I sent email from the system with the email client Alpine, it was taking a long time for email messages to be transmitted.

I timed how long it for the newaliases command to complete with the time command and found it took over a minute.

[root@moonpoint ~]# time newaliases
WARNING: local host name (moonpoint) is not qualified; see cf/README: WHO AM I?
/etc/aliases: 360 aliases, longest 69 bytes, 6276 bytes total

real    1m0.363s
user    0m0.074s
sys     0m0.078s
[root@moonpoint ~]#

I ran the command several times and found that it consistently took over a minute for the command to complete. I also timed how long it took to transmit an email with the mailx command with the time command and found it took about 20 1/2 seconds.

# time mailx -s 'Testing time for email transmission' example123450@example.com
This is a test of how long it takes to send email with mailx.

real    0m20.552s
user    0m0.004s
sys     0m0.034s
[root@moonpoint ~]#

I also noted quite a few entries like the following one in /var/log/maillog because there was no fully qualified domain name specified for the system:

Jun  4 16:27:19 frostdragon sendmail[12406]: My unqualified host name (moonpoint
) unknown; sleeping for retry

Sendmail accepts mail for domains listed in /etc/mail/local-host-names (see Getting sendmail to accept email for a domain), but that is not where you need to make an update for the local host name in this case. I was able to resolve the problem by using the hostnamectl command. The format is hostnamectl set-hostname fqdn where fqdn is the fully qualified domain name, e.g., "myserver.example.com", rather than just "myserver", if you happened to name your system "myserver" and you owned the domain name example.com. E.g., for moonpoint.com, I could use a command like the one below:

[root@moonpoint ~]# hostnamectl set-hostname moonpoint.com
[root@moonpoint ~]#

After I entered the appropriate hostname set-hostname command, I saw almost instant responses when I issued the mailq command. E.g., I saw the times below:

real    0m0.276s
user    0m0.038s
sys     0m0.077s

And sending email via Alpine and running the newaliases command also produced instant responses afterwards.


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