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Warning: mail(): SMTP server response: 551 Bad Recipient in BLAH BLAH
That's a message from your server.* It indicates that the PHP installation on your web server will not send the email because it considers the email address to be invalid.
I think you need to contact your hosting provider and show them this error message.
BTW, is it a Windows server? Maybe your host has certain email domains blocked etc but as noted it is the server thats considering the email passed as invalid.
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