Automation rule execute with internal modification

[YaourtSama]

The title may be a little senseless, but in fact it’s quite simple. I have a table in which are referenced all the web certificates, and i want to receive an message when a value name remaining times is below 90 its a formula: {expiration}-today() where expiration is the date of expiration

How can I make it to send mail automatically ?

I have this but i don’t know if it’ll work, if the rule will execute if a value change by itself.

I hope I am clear

[rdb]

Use this event (evénement) in the rule definition:

The rest should be trivial.

[YaourtSama]

Thank you, i didn’t think of using that condition, it totally makes sense.