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I had to apply the send as property via command line rather than by ECP. I went through all the mailboxes and it worked.<br />
<br />
It appears ECP doesnt apply all settings.<br />
<br />
Hope this helps other people
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I had to apply the send as property via command line rather than by ECP. I went through all the mailboxes and it worked.

It appears ECP doesnt apply all settings.

Hope this helps other people

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Hi all,<br />
Have a fresh Exchange 2013 install and have configured and setup shared mailboxes for the users. Users have to be a member of specific security group to be given permission to attach the mailbox or send as the attachable mailboxes address.<br />
The problem occurs when User A has an attachable mailbox (Mailbox 1) and creates a fresh email to be sent from the Mailbox 1 email address - it just gets stuck in User A's outbox. However, if User A was to reply to an email in Mailbox 1 the email would send just fine!<br />
<br />
I'm starting to suspect this is a permissions based problem but I've been over the active directory settings and the settings in the ECP and they match other working shared mailboxes.
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Hi all,
Have a fresh Exchange 2013 install and have configured and setup shared mailboxes for the users. Users have to be a member of specific security group to be given permission to attach the mailbox or send as the attachable mailboxes address.
The problem occurs when User A has an attachable mailbox (Mailbox 1) and creates a fresh email to be sent from the Mailbox 1 email address - it just gets stuck in User A's outbox. However, if User A was to reply to an email in Mailbox 1 the email would send just fine!

I'm starting to suspect this is a permissions based problem but I've been over the active directory settings and the settings in the ECP and they match other working shared mailboxes.

Exchange 2013 attached mailbox sending stuck in outbox folder

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.