How to send email when a condition is met?

Please show a noob the rules needed to send an email when temp reaches or exceeds 25 degrees or drops to 15 degrees or lower for the node listed below .

email has been configured and is working with other rules.

Number esp_fermenter_temp “Fermenter/Beer Cooler Temperature [%.2f Degree’s Celsius]” <temp_icon> (esp4) {mqtt="<[mymosquitto:/FermoStat/Fermenter_Temp/Fermenter_Temperature:state:default]"}

Cheers

Hi Dave,

i am using this rule for a push notification in a similar case. i think you can use this also by changing the items:

rule "Luftfeuchtigkeit_Badezimmer_zu_hoch"
when
	Item Tado_zone_Badezimmer_Humidity changed
then
	if (Tado_zone_Badezimmer_Humidity.state >= 60 && previousState <  60) {
		sendBroadcastNotification(
		"Im Badezimmer ist die Luftfeuchtigkeit zu hoch ("+Tado_zone_Badezimmer_Humidity.state+"%).")
	}
end
rule "Luftfeuchtigkeit_Badezimmer_wieder_ok"
when
	Item Tado_zone_Badezimmer_Humidity changed
then
	if (Tado_zone_Badezimmer_Humidity.state < 60 && previousState >=  60) {
		sendBroadcastNotification(
		"Im Badezimmer ist die Luftfeuchtigkeit wieder ok ("+Tado_zone_Badezimmer_Humidity.state+"%).")
	}
end

Thanks Alexander.
I will play with it.
Regards