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SBG (8.0.3) with 421 4.4.0 Error

  • 1.  SBG (8.0.3) with 421 4.4.0 Error

    Posted Feb 18, 2014 12:43 AM

    My user received the NDR with above error while sent out email to jdyst.com.

    And, I tried sent to this domain with gmail is OK, mxtoolbox can resolve mx record.

    any solution?