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What SEO tactics do you undertake on your clients sites that may have gotten them penalized.
He said *may have gotten them penalized*.
There's prob no help if you can't tell the tactics you undertook. Did you do anything dodgy? Just browse the google webmasters faq and answer their questions. If you can say no to all of them, there must be some others reason for your problem. However, in 99% of all cases a penalty isn't a real penalty. Could be a DB error (at google), a server error (at your site), or any other of dozens of possible reasons.