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Exchange 2010 : Unable to relay email

Posted on 2010-09-23
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Last Modified: 2013-11-30
i have exchange server 2010 serving my company domain; example.com

on top of that we have sub domain apple.example.com, email service hosted by external party.

right now i have issue when amy@example.com sending email to amy@apple.example.com with error "Unable to relay for amy@apple.example.com
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery."

DNS forward lookup zone created for example.com contain www and mail.
we also have apple.example.com zone for www.


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Question by:amywahab
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Akhater earned 2000 total points
ID: 33741899
what is the IP address of the mail server of apple.example.com

once you know that go to EMC->org config-> hub transport -> send connector

and create a new one for address apple.exxxample.com cost 1 and set it to use smart host relay the IP of the mailserver
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by:amywahab
ID: 33750892
Thanks Akhater! you solved my problem but then another new issue comes.  I will create a new question on that issue.
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Expert Comment

by:rashid47010
ID: 37772985
title: 550 5.7.1 Unable to relay


I am trying to send email from my exchange user to @gmail.com or @hotmail.com..

But receiving unable to relay error:
I have two receive connectors

One is
Client EX--------Permission tab--- I select Ananymous Users/Exchange Users/Exchange server and Lagancy Exchange Servers

Default EX---Permission Group--- Anonymous users/Exchange users

Kindly help me get rid of this problem

Rashid Iqbal
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