spam mail from my domain


our users often get spam mail saying that their email mailbox is full or password expired

how do i prevent them from receiving such emails ?


Authentication-Results: spf=pass (sender IP is;; dkim=none (message not

signed) header.d=none;; dmarc=none action=none;

Received-SPF: Pass ( domain of designates as permitted sender);


Received: from ( by ( with Microsoft SMTP

Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id

15.20.820.5 via Frontend Transport; Tue, 5 Jun 2018 21:31:51 +0000

Received: from (localhost [])

               by (SMTP Server) with ESMTP id 5AF183A9D

               for <>; Tue,  5 Jun 2018 17:31:50 -0400 (EDT)


Received: by (Authenticated sender: with ESMTPSA id D76FE54BD

               for <>; Tue,  5 Jun 2018 17:31:46 -0400 (EDT)



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