Mailer Daemon

Discussion in 'Server Operation' started by Trust35, Mar 26, 2019.

  1. Trust35

    Trust35 New Member

    Hi to all"
    I have a VPS for email sending.All is ok,but it is not possible to send email to GMAIl. Only to GMAIL.
    The return is:
    host []
    SMTP error from remote mail server after pipelined end of data:
    550-5.7.1 This message does not have authentication information or fails to pass
    550-5.7.1 authentication checks. To best protect our users from spam, the
    550-5.7.1 message has been blocked. Please visit
    550-5.7.1 for more
    550 5.7.1 information. l17si5709570wmj.118 - gsmtp

    Any ideas why?
    Thank you very much!

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