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+<!--
+title: "SMS Server Tools 3"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/health/notifications/smstools3/README.md
+-->
+
+# SMS Server Tools 3
+
+The [SMS Server Tools 3](http://smstools3.kekekasvi.com/) is a SMS Gateway software which can send and receive short messages through GSM modems and mobile phones.
+
+To have Netdata send notifications via SMS Server Tools 3, you'll first need to [install](http://smstools3.kekekasvi.com/index.php?p=compiling) and [configure](http://smstools3.kekekasvi.com/index.php?p=configure) smsd.
+
+Ensure that the user `netdata` can execute `sendsms`. Any user executing `sendsms` needs to:
+
+-   Have write permissions to `/tmp` and `/var/spool/sms/outgoing`
+-   Be a member of group `smsd`
+
+To ensure that the steps above are successful, just `su netdata` and execute `sendsms phone message`.
+
+You then just need to configure the recipient phone numbers in `health_alarm_notify.conf`:
+
+```sh
+#------------------------------------------------------------------------------
+# SMS Server Tools 3 (smstools3) global notification options
+
+# enable/disable sending SMS Server Tools 3 SMS notifications
+SEND_SMS="YES"
+
+# if a role's recipients are not configured, a notification will be sent to
+# this SMS channel (empty = do not send a notification for unconfigured
+# roles). Multiple recipients can be given like this: "PHONE1 PHONE2 ..."
+
+DEFAULT_RECIPIENT_SMS=""
+```
+
+Netdata uses the script `sendsms` that is installed by `smstools3` and just passes a phone number and a message to it. If `sendsms` is not in `$PATH`, you can pass its location in `health_alarm_notify.conf`:
+
+```sh
+# The full path of the sendsms command (smstools3).
+# If empty, the system $PATH will be searched for it.
+# If not found, SMS notifications will be silently disabled.
+sendsms=""
+```
+
+