Auto-forwarding from Yandex
1. Open your mailbox at yandex.ru (or login). Click on the gear «Message filtering».
2. Click «Create filter».
3. Select the condition «All messages excluding spam» — action «Forward to» and paste the address copied from the UseDesk.
4. Click «Create filter».
5. Open in the UseDesk section «Tickets» — confirmation letter of registration — confirm registration.