My Gmail account used to be a POP account for years and synchronised perfectly with all my other POP accounts in my archives folders, respecting all Rules. 

Suddenly all went crazy and I had to delete my gmail acc. and create a new one. 

But it self creates as an IMAP account and makes a mess of all my set-up. It is trying to reload over 15,000 old emails that are already saved in my archives folders on my general "On My Computer" account.

I hope all this makes sense and is clear enough.

Thanks for advice as it is really bothering me.