I can receive mail ican send mail. i can send attachment mail. But I cannot send mail with attachment. 

(The file just 1MB-3MB that i'm trying to send)

Can you help Me. with the detail suggestion. 

I was follow the FAQ and HELP in Zohomail

This is The message in my gmail. when i'm trying to send mail with attchment to info@dietmu.com from my gmail account

****

  info@dietmu.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain  dietmu.com  by  dietmu.com . [219.83.68.82].

The error that the other server returned was:
550-Please turn on SMTP Authentication in your mail client.
550-mail-oi0-f50.google.com   [209.85.218.50 ]:33350 is not permitted to relay
550 through this server without authentication.


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

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d= gmail.com ; s=20120113;
        h=mime-version:date:message- id:subject:from:to:content- type;
        bh=H7IK5UPMCkCC/ oq9Echk0q1Zr5eqOAXVXWP2G5nU9zA =;
        b= ltCUBq0HMcy1ei1QUg7WaVWnoZk6sW 8GHoyU+oQO9mKFABwmcVB4s7EWkd+ ym7i7ey
         1PNKt7BczTrsMF1Bu8K+ snvj4Opa1eAOOTjATvbAwCllEM/ xybwVMplXqFuXqQk0RA7s
         EY9nIc+ 44Negbwilq9TnsLU08r6XtPGKtsOuw +cbDiUv0s+RLc4PM2Hd1K0LGxlb/ p6f
         y0o/ 70DzEoCl4w2HFIIbBSZNU6jrBj908A hj9snEdXwvExYC2YCtCYfZyICBc323 V6dr
         7CMhxUcEPt1Z6j79FRwLhNRSYtSv7l B3BUHQ4w3oAZobayM/ ZxVdOUh1vQtduTP4uBT0
         H3Dg==
MIME-Version: 1.0
X-Received: by 10.182.20.195 with SMTP id p3mr16898910obe.6. 1433138402438;
 Sun, 31 May 2015 23:00:02 -0700 (PDT)
Received: by 10.76.90.7 with HTTP; Sun, 31 May 2015 23:00:02 -0700 (PDT)
Date: Mon, 1 Jun 2015 13:00:02 +0700
Message-ID: < CAHedqVmry7TDd9hCf1hszSTKGUtDBGWgSOaryCXLAHNJWy8F3g@mail.gmail.com >
Subject: sdf
From: Uli Uli < haibaiv@gmail.com >
To:  info@dietmu.com
Content-Type: multipart/mixed; boundary= e89a8f50316c64c85305176e8912

ssadfdsafdas