Suspecious mail IDs already present in Email Forwarding/Routing option

Today while activating Email forwarding for two domains; I found suspecious mail IDs ([email protected] & [email protected]) already added in Destination Address and same were used for Catch-All addresses.
Looks like there is some technical loop-hole and this is done by hackers.
Requesting Cloudflare Technical Team to look into this and fix it.
I am available to provide any details on this you want.

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