If your origin server’s IP address is changed you need to replace the IP address submitted for the A record with the new one via the following path:
ArvanCloud User Panel > Cloud DNS > Record Management > DNS Settings> A Record
In case you have already created an SPF record for your domain, the IP address submitted for it should also be changed.
As a result of changing the origin server address, your mail server address may also change. In this case, you need to modify the MX record of your domain and submit the new IP address in the ArvanCloud user panel.