How to transfer corporate mail from Yandex to your own server?

Question

Mail server

Good day.
There is a corporate mail on Yandex, the management decided to transfer the mail to its server.
When switching to traffic rules Yandex, the fellows themselves transferred all the mail to themselves, but there is no way to automatically unload it from them.
What can be transferred?

Answer 1

most likely Yandex allows you to work with mail via imap. thus on the server you configure mail too with imap. you did not specify what OS you have, but in the case of Unix, we take imapsync and send it to our server.
in dns we switch records of type A and MX to our ip. this way the whole world will know that mail should be sent to your server.
well, users set up accounts
somehow like this

Answer 2

You connect the box via IMAP to the mail client and archive all the contents in local folders. Previously, in the settings of the Yandex mailbox, you set in the "Mail processing rules" "forward to address", indicating the address of the new domain mailbox. thus, there will be no letters left in Yandex mail, all old letters will be on the local PC, and since the sent ones will have a new address, over time everyone will get used to the new addresses