I want to do email forwarding, the domain was purchased at Cloudflare, what is the limit of email forwarding allowed?
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You can find the limits for email routing here: Limits · Cloudflare Email Routing docs
Namely, 200 rules (custom addresses) and verified destinations. You can use a wildcard record to forward everything as well. There’s no limit on actual emails that I know of, other then a max email size of 25 MB per email. Important to note Cloudflare does not store emails for you, they merely forward them to your destination, they keep no copy.
(These are the same limits for if you bought a domain here or added one managed by an external registrar, in general this is the case for Cloudflare limits)