I've tried to move my domain from GoDaddy to Yandex Connect
And in the admin setting about my domain, I see:
MX records for this domain have not been set up
But MX record added automatically
Host: @
Record type: MX
Record value: mx.yandex.net.
Priority: 10
And it's look like in docs
I wrote a mail to support, but wait for an answer too long