Underscores in email address

Hello,

I have recently sent an electronic funds transfer (EFT) to someone and I sent it without the underscores in his hotmail email address. As when he texted me his address everything was underlined so I didn’t notice that here were underscores. However, I received confirmation from my bank funds were transferred and looked at my account and money was e-transferred (withdrawn from my account).

He said “you forgot the underscores, I didn’t receive the funds”

With the email address does Microsoft just use underscores to appear as spaces but really they disappear?
 
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