You can block spam, phishing attempts and other malicious emails by setting up spam blocking/filtering on your iPhone.
Spam Filter Settings
Individual email blocking/filtering settings can be easily set at once.
Using the "Simple Settings" is recommended because it automatically turns on the "Reject Spoofing Mail" function.
My SoftBank login > Mail Settings (MMS) > "Spam Blocking Settings" > "Simple Settings"
Individual spam filtering settings
Individual spam filtering settings can be set as needed.
It is recommended to turn on the "Reject Spoofing Mail" function.
The "Tomodachi E-mail Filter" cannot be used on iPhone.