sending to former internal domain (now external) incorrect

Hello, everyone,

I will try to explain myself as best and succinctly as possible:
I have an ISPConfig server (version 3.2.11p1) with 11 Domains inside it, one of them needs to be migrated (let's call it "foo") to an Exchange server but the old boxes stay on ISPConfig.
After some testing the migration works correctly and on the Exchange Server everything works correctly both sending and receiving.
From the ISP server anyone who tries to send an email to the "foo" domain returns the following error:

We renamed the domain "foo" in the ISP server as "oldfoo". We have followed all the guides but we can't find why it doesn't send the email externally.
From the Microsoft Server, on the other hand, they arrive correctly and even doing reply gives the usual error.
We restarted the postfix and devcot services, but the result was the same.

Has anyone run into this problem and can help us?

Thank you very much

 

Maybe postfix on that ISPConfig host still considers itself as mail server for that FOO domain (Why is it secret what that domain is?)
If you on your host query name service, what does it answer for that domain and its MX record?

 

Yes, that's the problem. We tried restarting it but it doesn't see the new host and thinks it still owns the domain.
In fact, it returns "Host not found."
We also changed and disabled the redirects it had in it with no effect.

 

In these two files there are no references to foo, I have attached both files, there are only references to the main mail server

 

Thank you very much, could you point me to where to look and what files to check?

 

Could you indicate how to check these tables?

 

ok, could you point us to the commands to type in at the command line?

 

We will carry out tests, at the moment thank you very much you have been very kind.
I will keep you updated whether positive or negative outcome.