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Email. Should I do this?

I have a website example.comhosted on godaddy. I just messed around with the PHP function mailand uploaded the following to my website at example.com:

mail( "someone@yahoo.com", "test", "test message", "From: someone@gmail.com" );

Why does it work? I mean, it shouldn't, right? The From domain is not "@ example.com". However, when I check my email address at someone@yahoo.com , I get a message from someone@gmail.com ... How can I (potentially) send an email from any email account without their password?

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Source: https://habr.com/ru/post/1762095/

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