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Kobayashi - 8:41 pm on Jan 29, 2009 (gmt 0)
If that is the intent, limiting the number of domains within an adgroup as a way of achieving this seems a bit much when you could simply just verify the display domain and final destination domain (whether it be at the ad or keyword level) go to the same domain when an ad or keyword level URL is added or edited and test any ads submitted before this policy went into effect - which I thought your company was already doing anyway. [edited by: Kobayashi at 8:47 pm (utc) on Jan. 29, 2009]
I can confirm that there is a change coming up, the intent of which is to make sure users are sent to the site to which they expect to be sent.