Please check the following.

You may have a spam filter enabled.

If you are using a spam filter, please allow receiving emails from the domain @nobori.me.

The message might be sent to the Spam or Trash folder.

If your security settings are configured to automatically delete suspicious messages or filter them into the Spam or Trash folder.

Please check your security settings and email software.

On an Android device

If you use an Android device, try to use Gmail for registration.

Your mailbox or server may run out of storage limit.

If you run out of space, you are unable to receive emails. Please free up space by increasing the storage of your mailbox or server, or deleting unnecessary mail and data.

The registered email address may be incorrect.