NDR recebida pelo Exchange Online: 550 5.0.350 Remote server returned an error -> 553 you are trying to use me [server-15.tower-56.messagelabs;.com] as a relay, but I have not been configured to let;you
Após migrar o fluxo de entrada de e-mails do Exchange 2010 ao Exchange Online, iniciou-se um problema com contatos externos com a NDR 550 5.0.350.
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