Security systems look for phrases and words in email to check if it’s ok to deliver them.
The it tech puts keywords like “Hello, I am a Nigerian Prince l” into the system, so any emails with “Hello I am a Nigerian Prince” are not allowed to be put in the mailbox.
If the scammer instead puts ” Hellø I am a Nïgerïan Prïnce” the computer doesn’t match it against the ‘dont deliver email saying I am a Nigerian Prince’, because it doesn’t match the original phrase.
Better systems can block this sort of trick, but not all companies do that, especially for home users
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