Why do not emails reach emails whose domain matches the internal AD domain?

Question

Domain Name System

Such a situation:
There is a domain on AD (windows 2012) company.com with 2 controllers (pdc-01.company.com and rdc-01.company.com)
There is corporate mail on Yandex also company.com.
It was decided to switch to your mail server. Iredmail was raised with authorization by domain accounts in the same subnet as AD. The company.ru domain was chosen for the new mail server . This domain was added to the trust domain in AD so that users can log in through it.
Now the mail goes and goes to all addresses except for mail on Yandex with the company.com domain, because the AD domain and the mail domain on Yandex are the same.
Please tell me how can I solve this problem?

Answer 1

I found a solution through the analogue of hubbed_hosts for postfix. Thanks
everyone for the help here .

Answer 2

does the @company.com mail on Yandex know about your new own mail at all?