550 5.1 1 Recipient Domain Rejected Invalid Dns. MTA p3plwbeout1306prodphx3secureservernet received this response from the destination host IP 1921854125 550550Please turn on SMTP Authentication in your mail client or login to the 550IMAP/POP3 server before sending your message.
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FinalRecipient rfc822service@testcomservicetestcom Status 500 RemoteMTA dns cmwebsitewelcomecom DiagnosticCode smtp 550 511 recipient domain rejected – invalid DNS Viewing 5 replies 1 through 5 (of 5 total) Plugin Author Slava Abakumov.
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The error ‘ 550 511 User unknown ‘ is commonly noticed in Microsoft Exchange servers It can happen either with a single mail account or a distribution group of email addresses Microsoft Exchange 2010 has implemented a security parameter which require that all senders are authenticated to prevent spamming.
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550 511 means that the recipient email server believes that the email address does not exist at the destination domain and therefore has no way to deliver it Unless you simply made a typo in the email address this is not something that you can fix and must be addressed at the other end.
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The error ‘ 550 511 User unknown ‘ is commonly noticed in Microsoft Exchange servers It can happen either with a single mail account or a distribution group of email addresses Microsoft Exchange 2010 has implemented a security parameter which require that all senders are authenticated to prevent spamming.
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The error message #550 511 is generated in the following conditions 1 The recipient email address was entered wrongly 2 No such recipient is present in the destination email system 3 The recipient mailbox has been moved 4 An invalid legacy domain name exists for the recipient mailbox Active Directory2015082620150312.
