Hi,
I can send the mail from my exchange server to Gmail account but I do get this when I reply to it from Gmail account.

Delivery to the following recipient failed permanently:

     Administrator@mydomain1.co

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain mydomain1.co by smtp.secureserver.net. [216.69.186.201].

The error that the other server returned was:
550 #5.1.0 Address rejected.

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

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        bh=aliRq3VYaf2xiO230cfp4ESEwgr/Zz195KNQ5zzAasE=;
        b=VztJrLo4oes94AqEO9VhXuy9tbUKigltQskO29lcsebu8c7B5S3Z3VtODaSkvAwoS/
         X4QeTs9pIIcfnbzAY3LbmUycvmxJvP8GYLKql+L6/NKqyA2AKX+dfGTyITIjOKVzQrO3
         1rCQPP1utbNkc2sDMODcFB5K0lyvd+5f+tGH2bu+p3pfc7boh1hmZ16Gr6fszN0WCb3V
         9dGfEltKWHYO0ZWgP1cCftVHYfiSC05DTmTCpIF4HlxAB0tSRQLVug5urSZAiVQKPZTl
         KnkaJxbLWsqu9MMNrGYN2EZMaKIL01KSQRgMQmfDWiZKIUUOVMLGtFpfzH3bkVG2Y0wz
         OxTg==
MIME-Version: 1.0
X-Received: by 10.60.144.230 with SMTP id sp6mr17297289oeb.29.1384157815521;
 Mon, 11 Nov 2013 00:16:55 -0800 (PST)
Received: by 10.60.115.70 with HTTP; Mon, 11 Nov 2013 00:16:55 -0800 (PST)
In-Reply-To: <4D8CFD0D3EF23943A426963C33E732680E6853@WIN-AIGPMD763AL.mydomain1.co>
References: <4D8CFD0D3EF23943A426963C33E732680E6853@WIN-AIGPMD763AL.mydomain1.co>
Date: Mon, 11 Nov 2013 16:16:55 +0800
Message-ID: <CAPj3yy1_y3oBHDP5wtEJqBUBHP_thM+fANBEaRTNMFnoXrbEmA@mail.gmail.com>
Subject: Re: 13nov11
From: Edward Chan <peterchen@gmail.com>
To: Administrator <Administrator@mydomain1.co>
Content-Type: multipart/alternative; boundary=047d7b5d5c14e84a5604eae25a63

while I can ping

mydomain1.co

fine. And within Hub Transport > Accepted domains,

I do see the relevant line for

mydomai