To set up a mail domain within Yandex.Connect, do the following:
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Configure the domain to work correctly with Yandex.Connect in one of the available ways:
Configuring domain records for Yandex.Connect operation
To maintain a domain on our NS and work with Yandex.Connect, do the following:
In chapter "
Webmaster»Click on your domain card:

Install records
MXprovided in Yandex.Connect at the very bottom of the page that opens.
Important! After changing MX records, mail will stop arriving at
mailboxeshosted on our hosting.
Add the rest of the specified entries in the domain settings.
Wait for the update
DNS cache... This usually takes several hours (maximum 24).