change email server

If I have a Domain with a email server in USA side.

Can I just change this MX record to my HK EMail server IP?

then HK email can get this domain email too? and not affect other thing?

or

1. Park the Domain to HK ISP
2. change A, PTR , MX record to my HK ISP IP too? same as my HK email IP?

thanks

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can USA IP  change to HK IP?

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and need apply it at USA isp or HK ISP side? or both.

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