Yandex mail and hetzner, SMTP Banner Check, how to set it up correctly?

Question

Yandex

Good afternoon,
There are a couple of domains, there is one server (one IP) on hetzner that hosts two sites for these domains.
Domains added to pdd.yandex.ru to work with mail. But not delegated to Yandex.
An entry has been added to the dns server on hetzner:
@ IN MX 10 mx.yandex.net.
For each of the domains.
Mail comes and goes perfectly to the addresses @mydomain1.ru and @mydomain2.ru
But, messages began to come that the IP was added to the spam database. Checked on https://mxtoolbox.com, issued,
SMTP Banner Check Reverse DNS does not match SMTP Banner
(The reason for IP getting into spam.) The
question is how to configure it correctly so that during the test it gives the correct server name (domain)?

Answer 1

https://toster.ru/search?q=dkim+ptr