non-cyclical email sending

[Zoli]

Hello,
I want to send an email, but not to all group address messages, only to those that change. For example, if a sensor cyclically sends an error signal, send an email only the first time.
Sending an email works by the way, I just can't solve this filtering.
Thank you!

[Daniel]

https://forum.logicmachine.net/showthrea...9#pid36519

[Zoli]

https://forum.logicmachine.net/showthrea...9#pid36519

Thanks for the answer.
Of course it works