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# email
You need a working `sendmail` command for email alerts to work. Almost all MTAs provide a `sendmail` interface.
Netdata sends all emails as user `netdata`, so make sure your `sendmail` works for local users.
email notifications look like this:
## configuration
To edit `health_alarm_notify.conf` on your system run `/etc/netdata/edit-config health_alarm_notify.conf`.
You can configure recipients in [`/etc/netdata/health_alarm_notify.conf`](https://github.com/netdata/netdata/blob/99d44b7d0c4e006b11318a28ba4a7e7d3f9b3bae/conf.d/health_alarm_notify.conf#L101).
You can also configure per role recipients [in the same file, a few lines below](https://github.com/netdata/netdata/blob/99d44b7d0c4e006b11318a28ba4a7e7d3f9b3bae/conf.d/health_alarm_notify.conf#L313).
Changes to this file do not require a Netdata restart.
You can test your configuration by issuing the commands:
```sh
# become user netdata
sudo su -s /bin/bash netdata
# send a test alarm
/usr/libexec/netdata/plugins.d/alarm-notify.sh test [ROLE]
```
Where `[ROLE]` is the role you want to test. The default (if you don't give a `[ROLE]`) is `sysadmin`.
Note that in versions before 1.16, the plugins.d directory may be installed in a different location in certain OSs (e.g. under `/usr/lib/netdata`).
You can always find the location of the alarm-notify.sh script in `netdata.conf`.
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