how to block unwanted 'bad' messages
How to stop or block very bad messages on my apple products
iMac 24″, macOS 12.3
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See this Apple articles below:
Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch
Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support
Recognize and avoid phishing messages, phony support calls, and other scams
Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support