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Emailing google might just put them on alert to look at your account more closely. Also, they might reduce earnings from clicks that were probably legitimate. You are basically putting yourself at risk. My advice, don't e-mail google. Let them e-mail you.
If they find a problem, and it was not your fault, I'm sure you would have no problem proving this to them.
I've got a long standing relationship with Adsense, no fears of fraudulent activity at my end. If someone beyond my control has decided to make trouble for me with fraudulent click activity I would think that the only thing I have going for me is my cooperation offered to Adsense.
I noticed a bunch of clicks that came from a school and there was no revenue for any of those clicks. I chose not to email them this time
I got the impression from Google that we don't need to write to them every time. I can tell they caught it because they don't have any earnings listed for them.
I am certain my clicks like this are from a school. Kids just start fooling around with things like that. I've had them signing up for my newsletter with crazy named emails. Kids will be kids and I think AdSense understands that.
If they start canceling the accounts for everyone who has sites that are used in schools they will be dropping a lot of good content sites.