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In the event where the mailbox service provider require you to make changes to the DNS, MX Records to the Cloudfare.
There are 2 options:
1. Provide us the login details to the mailbox service provider; you can change the password when we are done
2. Let us know what MX record or DNS you need us to help add on cloudfare
-Send us the parameters and screenshots of the instructions provided by the mailbox service provider
Refer to this article on how to integrate Google Mailbox:
https://help.chainupcloud.com/x/BAC5