How to find boxes to the letters I've lost with El Capitan update?

I recently updated my iMac to El Capitan. After the update, I've lost all my mailboxes that were related to my ISP account. Is it possible to recover these lost go to balls (they are still in my ISP account)? If so, how should I do this?

In addition, I can't create a new mailboxes that are related to my ISP. When I try to create a new mailbox, I can only choose "on my Mac" in the menu dropdown.

Help, please.

Very easy if you have been a backup with Time Machine. Just restore the mailbox in Time Machine.

Tags: Mac OS & System Software

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