How to set up Exchange externally?

Question

Email

There is an Exchange 2013 operating in the local network and a domain purchased on nic.ru. There is also an external white IP. How to configure Exchange 2013 to receive and send emails from outside? I note that earlier we already had a domain at hc.ru and Exchange was configured to work with external addresses, but recently we had to change the registrar and now we need to restore mail. Who can tell me where to dig and where to configure what?

Answer 1

you need to change the External URL for the services
change the certificates
change the settings in: Accepted domains, E-mail address policies, Receive connectors, Send connectors
or, more precisely, look for information on migrating Exchange to another domain name ...... or something like that
yourself where I plan to do this in a month, so I can’t tell you about the nuances yet, I
plan to do it on test servers one of these days, but so far I can’t get there

Answer 2

1. Set up MX records, dns hosting, either buy (nic.ru - clamps, and wants money for it), or use a free one, for example from CloudFlare
2. On Exchange - add a new domain to AcceptedDomains, update the email address policy (or add new, depending on what task).
3. On Exchange - configure connectors if necessary.
Because the infrastructure is described in general terms, the answer is also described in large blocks.