Senders receive a message copy after they click "Reply to All" in Exchange ActiveSync

Symptoms
Microsoft Exchange ActiveSync users receive a copy of a message when they click Reply to All for a message in their mailbox.
Cause
This problem occurs because the client is receiving multiple PrimarySmtpAddress values in the response to the Settings command from the server that is running Exchange Server. When the user clicks Reply to All, the client does not detect the second PrimarySmtpAddress value within the recipient list. Therefore, the client includes the sender as a recipient.

The second PrimarySmtpAddress value is any SMTP address for the mailbox that is prefixed by an all-capitalized code value. The most common examples of such a value are the "SIP" address for Microsoft Lync and the "NOTES" address for Lotus Notes.
Resolution
To resolve this problem in Exchange Server 2013 or Exchange Server 2010, install one of the following updates:
Workaround
To work around this problem, manually change any existing address that is not the Primary address to all-lowercase characters.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
The ActiveSync mailbox log contains a response to the Settings command that resembles the following:

<?xml version="1.0" encoding="utf-8" ?><Settings xmlns="Settings:"> <Status>1</Status> <UserInformation>  <Status>1</Status>  <Get>  <Accounts>  <Account>  <EmailAddresses>  <SmtpAddress>user@mail.contoso.onmicrosoft.com</SmtpAddress>  <PrimarySmtpAddress>user@contoso.onmicrosoft.com</PrimarySmtpAddress>  <SmtpAddress>demo@contoso.onmicrosoft.com</SmtpAddress>  <PrimarySmtpAddress>userSIP@contoso.onmicrosoft.com</PrimarySmtpAddress>  </EmailAddresses>  </Account>  </Accounts>  </Get> </UserInformation> <DeviceInformation>  <Status>1</Status> </DeviceInformation></Settings>
Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
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Article ID: 3012580 - Last Review: 08/03/2016 17:36:00 - Revision: 4.1

Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard, Microsoft Exchange Server 2010 Enterprise, Microsoft Exchange Server 2010 Standard, Exchange Online via Office 365 A Plans, Exchange Online via Office 365 E Plans, Exchange Online via Office 365 G Plans, Exchange Online via Office 365 P Plans

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