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At some point their algo must decide whether to index or not, and would know where abouts the error exists. An automatic e-mail could be sent with the info to the webdesigner.
I would be quite happy pay for this service, and the cost shouldn't be that large for an automatic email. A fiver a year? Just to let us know where the error existed.
And as we would be only paying for the check, when the website's fine no automatic e-mail has to be sent.
When its been fine for a year or so I suppose I'd stop paying, but then there will always be new clients for Google.
No.
This would create a spam fest. Just think what would happen if Google told all the spammers exactly what kind of spam they will tolerate!
Or, if you are talking about html errors, there are plenty of validators available already.
Could it be that Google caught me mid-validation on the last crawl, picking up pages that had the validation line but were not yet fully validated? I'm having problems in working out why my site didn't get indexed.
regarding spammers,
It would be easy to compare this months results of a site with major errors to last months, probably making it easier to pick up people trying to spam. (Every month same URL giving critical errors)