unable to receive emails

unable to receive emails

When somebody is sending me emails, this is what they are receiving:

Delivery to the following recipient failed permanently:

      dharni@knowmployee.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain  knowmployee.com  by us2.mx2.mailhostbox.com . [208.91.199.205].

The error that the other server returned was:
550-5.1.1 < dharni@knowmployee.com >: Recipient address rejected: User unknown in virtual alias table
550 5.1.1 Please see  http://support.mailhostbox.com/email-administrators-guide/error-codes  for explanation of the problem.


----- Original message -----

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d= instigence-com.20150623.gappssmtp.com ; s=20150623;
        h=mime-version:in-reply-to: references:date:message-id: subject:from:to;
        bh= jsjqRLh5XguNlxN4EBitkFzRoKp4wZ UIydfCFdxkS6A=;
        b=U19TD+ Y9r8W17YM38IIYVSyOcsz43s6YPWcO jxts/f77SnHfCZmYGfLCIqGPe8QjQo
         kmpnM0dyMFTJAj+p1Op1oM5Yfk+ D7Wuh7M2XKwBM+ EgO10xjPFSeNv6wHaZb+sXH447p
         ubkqKBz/ bXs5L54k5MH8Wg2PtMzyoh6j296QNE zQeb4RpN8hqyFJW2gAxxZpl8uCQviV
         e6FTd9fe4Dc1Fs93qE+ BhDL9eeUzlziqxZ+ ZogbXGej1xo7Mcc7K9D6gL1C40eX7k UMC
         L3662O1Ti6YEJrotEW6Tca1eTNkzno eT0jm977uD6D2/ fPhKlaAMQOFvubJp9dCAhrMT
         IErw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d= 1e100.net ; s=20130820;
        h=x-gm-message-state:mime- version:in-reply-to: references:date
         :message-id:subject:from:to;
        bh= jsjqRLh5XguNlxN4EBitkFzRoKp4wZ UIydfCFdxkS6A=;
        b= kP0i1Fiamu7l8GHRMiKrJzhRdvrLfR HoXSjA29Ke4rboz3tgwGWgVsPC88Em JUncxx
         5TDcmCa2Sa4q7vLe4WfFDVhbraC28z /yEndpORfqGN7/yzsgFJV/ bcRfppIZfPiLLuL1
         9mgTzgO7voAeejhaAo5OfMKw5iFZu0 sdwULqAffu6uPIaojiKbCvCW+ Jv1nRVkr+fvz4
         B8GTSf+KRDDdmYUqYl+ gOeInwJw52rNnc4FlL8nLs3vu6a0O0 2Lw8kt0Wn5hsNvqxr9S
         /NBZnU7HibPw/ AoABLwujdD6goqMkTFACU8URT4Mq6x HpziaW8ja/AXfBaLTxuxKS6BD
         MpBg==
X-Gm-Message-State: AD7BkJJEVqPnOslbZs09+ cXJgVdk7t2kU// YOL2geByY65zpFjZNYAbfS23AfdQJH TF0ZS8/bVZvEbRbjUTOrQ==
MIME-Version: 1.0
X-Received: by 10.140.21.232 with SMTP id 95mr44196626qgl.12. 1457542049339;
 Wed, 09 Mar 2016 08:47:29 -0800 (PST)
Received: by 10.55.187.196 with HTTP; Wed, 9 Mar 2016 08:47:28 -0800 (PST)
X-Originating-IP: [45.114.195.107]
In-Reply-To: < 1535c46586a.b0819ef154998.2705310499162483760@knowmployee.com >
References: < 1535c46586a.b0819ef154998.2705310499162483760@knowmployee.com >
Date: Wed, 9 Mar 2016 22:17:28 +0530
Message-ID: < CAD1hzZpddxi4D1G-R_N+CwHaVoGBnBhLrU7WfNHFxcTzi3EDMQ@mail.gmail.com >
Subject: Re: test email
From: Amit Gupta < amit@instigence.com >
To: Dharni Gupta < dharni@knowmployee.com >
Content-Type: multipart/mixed; boundary= 001a11c1567818e206052da074a5