ActiveSync can't send emails to certain accounts, but problem does not exsit in OWA / Outlook

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I setup our first Exchange 2010 server with several test mailboxes. Tested all connection protocals and there is a weird problem about ActiveSync.

Using the same account to perform the tests,
- When logging on through Outlook and OWA (from the Internet)
I can receive from and send emails to any External / Internal address.

- When logging on through ActiveSync, on iPhone and Andriod
- I can receive emails sent from anywhere
- I can send email to an external Internet address, it was delivered.
- I can send email to another corp account which is homed on the same server.
- When sending email to a corp account which was under Ex2007 / Ex2003 server, the mail got returned. The NDR doesn't really tell me anything... However, sending emails from the same sender account to the same recepient accounts worked perfectly under Outlook and OWA sessions.

Below is the NDR when sending from (home server: EX2010.comp.local) to (home server: EX2007.comp.local)

Diagnostic information for administrators:

Generating server:
#< #5.1.0> #SMTP#

Original message headers:

X-svr-date: mx2, 10/27/2010 14:03:04 PDT -7
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.4721
Received: from EX2007.comp.local ([]) by
with Microsoft SMTPSVC(6.0.3790.4675); Wed, 27 Oct 2010 14:03:04 -0700
Received: from EX2010.comp.local ( by EX2007.comp.local
( with Microsoft SMTP Server (TLS) id; Wed, 27 Oct 2010
14:03:04 -0700

Received: from EX2010.comp.local ([::1]) by EX2010.comp.local ([::1]) with
mapi; Wed, 27 Oct 2010 14:03:03 -0700

Content-Type: application/ms-tnef; name=" winmail.dat"
Content-Transfer-Encoding: quoted-printable

From: <>
To: Help Desk <>
Subject: Test ActiveSync Exchange 2010
Thread-Topic: Test ActiveSync Exchange 2010
thread-index: Act2Glfp+DzV/54LTOaMh2f+czPYEw==

Date: Wed, 27 Oct 2010 14:03:40 -0700

Message-ID: <>

Accept-Language: en-US

Content-Language: en-US
X-MS-TNEF-Correlator: <>
MIME-Version: 1.0
Return-Path: <>

X-OriginalArrivalTime: 27 Oct 2010 21:03:04.0520 (UTC) FILETIME=[59094C80:01CB761A]


did you try test-activesyncConnectivity cmdlet on the 2010 CAS?System and Network Administrator - MCSA security, CCNA,VCP3,VCP4,MCITP


Having the same problem. I am logged in as domain admin on 2010 CAS.

Cannot process argument transformation on parameter 'MailboxCredential'. Cannot convert the " me@mydomain.c

om" value of type " System.String" to type " System.Management.Automation.PSCredential" .
+ CategoryInfo : InvalidData: :)) [Test-ActiveSyncConnectivity], ParameterBindin...mationException
+ FullyQualifiedErrorId : ParameterArgumentTransformationError,Test-ActiveSyncConnectivity
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