# Send Email Alarm only once
**URL:** https://discourse.nodered.org/t/send-email-alarm-only-once/43184
**Category:** General
**Created:** [25 March 2021 09:25 UTC](https://discourse.nodered.org/t/send-email-alarm-only-once/43184 "2021-03-25T09:25:37Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@monokumamon](https://discourse.nodered.org/u/monokumamon)
#### Post date: [25 March 2021 09:25 UTC](https://discourse.nodered.org/t/send-email-alarm-only-once/43184/1 "2021-03-25T09:25:37Z")
Hello, im new to Node-RED. I'm using a vibration sensor and I manage to send an email when the alarm triggered. The problem I'm having right now is, I want Node-RED only send the alarm once not multiple times when the alarm triggered. Is there a way to do this?
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### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [25 March 2021 09:53 UTC](https://discourse.nodered.org/t/send-email-alarm-only-once/43184/2 "2021-03-25T09:53:32Z")
> [@monokumamon](#):
>
> Is there a way to do this?
Sure, create a flow variable that will act as a switch. before you send the message, check if a msg has been sent (`switch` node) and after the email node, set the variable to indicate the message has been sent (`change` node).
Of course now you have to think about how you will reset the switch...after 5 hours, 10 minutes? I'd add a `delay` and another `change` node - after the first `change` node - to reset the switch
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [8 April 2021 09:53 UTC](https://discourse.nodered.org/t/send-email-alarm-only-once/43184/3 "2021-04-08T09:53:39Z")
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