Mails stuck in Outbox when sending as shared mailbox

Hi
I have some users who use a shared mailbox [email protected]
Their primary mail is their own [email protected] and the shared mailbox is the secondary. When they try to send mail as [email protected], the mails get stuck in the Outbox folder or the shared mailbox. Sometimes, only one user has a problem, sometimes 3 of
them (there are 6 members). Sometimes the problem is resolved, sometimes the problem happens again. Sometimes, the mail will be stuck in Outbox for 10 seconds then send. The recipient does not receive the mail when it gets stuck on the Outbox. I tried to add
a test user with the same privilege as this group and tried to log-in the computer of the user who is having the problem. In the test user, mails can be sent as the shared mailbox, but going back to the original user, it gets stuck on the Outbox. So I think
this is not a problem of the computer. I tried to check if the DelegateSentItemsStyle can be changed but this parameter is not existing in the registry of the user. Any advice? Thanks.

Hello meowchao,
It puzzles me that they sometimes can send. Do you know Powershell?
If so, please run the following command:
Get-MailboxPermission [email protected]
(where you type the proper name of your shared mailbox)
In the list produced, does all users who should have access to this mailbox appear and have full access?
If you don't know Powershell:  http://help.outlook.com/en-us/140/cc952755.aspx
Best regards George

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