Email step error

Website Building
#1

when is send email , i got this error. please tell me complete setup of mx record in cloudflare.

There was a temporary problem delivering your message to info@eample.com . Gmail will retry for 20 more hours. You’ll be notified if the delivery fails permanently.

#2

Depends who your registrar is?
If you’ve already parked the domain with us?
What email solution are you using i.e. Migadu, Zoho, ImprovMX?

#3