I have a clients website terminating shortly in 2 weeks and being replaced by a new website (new domain) that has already been live for a couple of months. The plan for the 301 redirects was intended to be gradual over a few months due to the size of the site, however due to technical difficulties around the URL structure they could not take place.
It is a mammoth, multi-lingual website with up 300,000 indexed pages. The plan is to implement bulk redirects to the relevant folders on the new site, however this has to take place with a week. I have heard Matt Cutts once say that anything over 500 redirects gets flagged with his team as potentially spammy.
I'd be grateful if anybody had any advice regarding this task and if what I'm doing could be dangerous with consequences?