If my buyer ask me to deliver my output to buy’s personal email, can I do that or is it volatile TOS?
Yes it would break the ToS.
All deliveries need to be done via the ‘deliver now’ button on the order page.
In addition to what @smiler3d advised make sure to read the Terms of Service at the bottom of the Fiverr main page for the rules as to how Fiverr works.
Everything is explained in detail there.