How to set up a mail server with a private DNS and relay over a public mail

How to set up the mail server that we can send and pick up emails inside and outside?
Our private network has the DNS name dnsname1.private.
We have our privat DNS Server and he can forward requests to outside over our router.
Our public emails are hosted by an internet provider. This dns name is dnsname2.com and dnsname2.org.
How we have to set up our mail server that we can pick up our emails from our public dnsname2.com?
And when we write an email how we have to set up it that the dnsname is dansname2.com and not dnsname1.private?

If you want to move your mailservice to your own (internal) server, start by making sure you can recieve traffic on port TCP 25 (SMTP). Some ISPs blocks this port, especially on "non business" connections.
Can you send mail from your LAN directly to where your mail is hosted using port 25 TCP or do you have to relay via your ISP?
You have a static public IP?

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