[kanetrain]

I know for a fact that Gmail has implemented some (overly aggressive, and really far-reaching) "spam" triggers over the last few months. Many of them have been scaled way back over the past few weeks but the crux of the new Gmail "spam" filters centered around what Jake is explaining here: Non-engagement.

This is troubling in it's own right because of the possibility of exploitation for nefarious purposes to hurt someone else's site. I did not know about the possibility of search results being affected by the same overly-aggressive spam filters. This may not be the case, but if this is true, it is troubling.

The notion that email engagement is a good indicator of a site's sender reputation or a site's search reputation is problematic. This can be gamed so easily. I could set up 5,000 fake email addresses at gmail, subscribe to my competitor's email newsletter, and then never ever open any email for the next 6 months. Presumably, this would get them blacklisted in Gmail and (possibly) blacklisted and dropped from organic search results as well.

Cue the black market for non-engaging gmail accounts in 3...2...1...

[drakaal]

You assume there aren't easier ways to game Google to de-rank people. Buy popunders on porn sites to your competition.

You can de-rank them, get them kicked out of adsense, and more in a week for under $500. Seen reputation management services do this to get bad reviews to fall in rankings lots of times.