Mail delivery failed

Hello,
A few days ago I received many bounced emails (Mail delivery failed)
What is the reason? Does it really coincide that the client who has registered has written his email wrong? So many would be a lot of coincidence.
I have a problem that causes these failures when sending emails automatically when a client registers on my website?

Thanks for your help

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Answered: 04/21/2019 9:32 am

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