I just started receiving hundreds of spam emails from all over the world

Hello,

Please find the article below in regards to spam emails.

https://support.apple.com/en-us/HT204759

Please do not share your email address for sign ups to free stuff, discounts, or lucky draw.

There's no way to prevent spam emails being sent to you. You can either wait out the onslaught or change your email address. It should die down in time but no one can say how long that will take.

Perhaps you posted your email address in an online forum? That's a sure way to be inundated with spam.