Welcome to the Q&A Forum

Hello everybody ! My client has a blog for 2 years with many posts on overblog, a French blog host like Blogger. Now we are currently building a new website with a new blog within the site. Those posts are valuable content that bring some traffic to the old blog. My idea was to re-publish those posts on the new blog to start with some good content. Unfortunately, the blog host don't let me use 301 redirects or re=canonical tags to tell search engines that the post is now in the new website and avoid duplicate content. What is the best SEO solution in this case ? Can we delete the posts on the old blog and publish them in the new one ? Thanks for your help! Bruno