What should I do if iMessage spam messages flood?

I've seen all spam messages sent to email addresses, which may be a phone number leak or an email address registered with an APPLEID leak (the latter is more likely because the phone leak may have occupied the mobile phone).

Solution-Settings-Information-Sending and Receiving Addresses-You can see the mobile phone number and APPLEID here, so you can delete the APPLEID option.

In other words, the other party can only send imessage to your mobile phone through the phone number. I believe everyone uses imessage, and few people send and receive it with APPLEID address, so deleting it has no effect.

The method doe not affect that normal use of short messages of operator. It may not completely block spam, but it will be quieter if you turn it off when you are not using it.