Nut upsuser - Jan 2026 - help requested for setting up email notification of UPS events

Dear list,

I apologize for my lack of expertise in troubleshooting this problem. I
am trying to setup email notification to myself in the event of several
UPS events. I did read and follow the documentation at
https://networkupstools.org/docs/user-manual.chunked/Advanced_usage_scheduling_notes.html.

I have a working UPS setup on my NAS, which runs FreeBSD14.3. It can
communicate with the UPS, and both nut and upsd services are running
as expected. I made the following changes in the upsmon.conf to enable
email notification to myself:

NOTIFYCMD /usr/local/bin/mailme
NOTIFYFLAG ONLINE       SYSLOG+WALL+EXEC
NOTIFYFLAG ONBATT       SYSLOG+WALL+EXEC
NOTIFYFLAG FSD          SYSLOG+WALL+EXEC
NOTIFYFLAG COMMOK       SYSLOG+WALL+EXEC
NOTIFYFLAG COMMBAD      SYSLOG+WALL+EXEC
NOTIFYFLAG SHUTDOWN     SYSLOG+WALL+EXEC
NOTIFYFLAG REPLBATT     SYSLOG+WALL+EXEC
NOTIFYFLAG NOCOMM       SYSLOG+WALL+EXEC
NOTIFYFLAG NOPARENT     SYSLOG+WALL+EXEC

This is the script /usr/local/bin/mailme:

#!/usr/bin/env sh

echo "$*" | /usr/bin/mail -s "Notification for UPS event"
myemail at example.com

Documentations recommends restarting upsmon after these changes; however
upsmon is a client and it is not running as a service at least in my
setting. I did reload and restarted nut and upsd services without errors
after making these changes. Moreover, I tested my script by executing it
from command line and received an email with the correct subject and
empty content as expected. However, a power outage simulation by
plugging the UPS off did not trigger an email notification. What am I
missing? Any pointers will be greatly appreciated.

Hakayova

hakayova via Nut-upsuser <nut-upsuser at alioth-lists.debian.net> writes:
> I have a working UPS setup on my NAS, which runs FreeBSD14.3. It can
> communicate with the UPS, and both nut and upsd services are running
> as expected. I made the following changes in the upsmon.conf to enable
> email notification to myself:
>
> NOTIFYCMD /usr/local/bin/mailme
> NOTIFYFLAG ONLINE       SYSLOG+WALL+EXEC
> NOTIFYFLAG ONBATT       SYSLOG+WALL+EXEC
> NOTIFYFLAG FSD          SYSLOG+WALL+EXEC
> NOTIFYFLAG COMMOK       SYSLOG+WALL+EXEC
> NOTIFYFLAG COMMBAD      SYSLOG+WALL+EXEC
> NOTIFYFLAG SHUTDOWN     SYSLOG+WALL+EXEC
> NOTIFYFLAG REPLBATT     SYSLOG+WALL+EXEC
> NOTIFYFLAG NOCOMM       SYSLOG+WALL+EXEC
> NOTIFYFLAG NOPARENT     SYSLOG+WALL+EXEC
>
> This is the script /usr/local/bin/mailme:
>
> #!/usr/bin/env sh
>
> echo "$*" | /usr/bin/mail -s "Notification for UPS
event" myemail at example.com

  - check that the script is 755 or 555 permissions

  - become the nut user with su, /bin/sh, and clear out the environment.
    Set PATH to dafault.  Then
      /usr/local/bin/mailme foo bar baz
    and see what happens

  - read /var/log/messages and /var/log/maillog, or however you spell
    those logs on your system