não consigo enviar email!

não consigo enviar email!

consigo receber e-mail normalmente no meu domínio. mas por algum motivo não consigo enviar e-mail. aparece a seguinte mensagem: "e-mail invalido" sendo que os e-mails utilizados são validos!
gostaria da ajuda de vocês para resolver esse problema!

obrigado!
      Zoho Marketing Automation
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