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Exchange 2013 attached mailbox sending stuck in outbox folder

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.
1 Solution
piyushranusriSystem Cloud SpecialistCommented:
did you see in outlook that cache mode is enabled ?
if not then enable and restart your outlook.

and just to inform that this is known issue (updated by MS Support).

Please share the output
purpleoakAuthor Commented:
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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