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501 Connection rejected by policy [7.7] 10802

  • 1.  501 Connection rejected by policy [7.7] 10802

    Posted Jun 30, 2016 04:13 AM

    Hello

    We are permission-based email marketing provider and we only allowed client to send opt-in emails.

    We have this error when sending to some domains.

    But we just received this report

    501 Connection rejected by policy [7.7] 10802, please visit www.messagelabs.com/support for more details about this error message.

    And it is not send IP address.

    So that we don't know which IP  address on the Symantec blacklist and how to eliminate this blockade.

    Please help!

    THANK YOU!