How do I download *all* the messages that are now on a new webamail server into my desktop em client?

My email comes from toast,net. Till last week it was imap via gmail. They’ve now transferred it to their own webmail server. I can’t download all the messages that are now on the new webmail server into my desktop em client. How do I do it? This is now urgent!

Hello Irris, please understand that priority support is only available to PRO license customers, if you require priority answers, make sure to purchase a PRO license here, 

If your mail server has changed it’s settings and moved to other servers, you should be able to re-setup the account using automatic setup or refer to your mail server support in order to get the correct server settings that are setup in Tools > Accounts > Your yahoo account.