I had records in my DNS panel:
subdomain type domain priority (for MX) @ CNAME app-***.rhcloud.com. @ MX mx.yandex.ru. 10 mail CNAME domain.mail.yandex.net. www CNAME app-***.rhcloud.com.
Abd so, first line overwrite other.
Question: what to do with that all? I can't create A record because IP of app-*.rhcloud.com. can be dynamic.