Hello,

I have 25 users who are experiencing same issue with shared mailbox on Ex2010 with Outlook 2010 (some on SP1)

We have configured Shared Mailbox A, we also have security group B which is assigned with Full Access on mailbox A. I am member of security group B. No one shouldn't Send On Behalf or Send As mailbox A - mailbox A is used only to share emails etc.

If I try to send email which is stored in mailbox A, I get following error:

You don't have permission to send the message on behalf of the specified user

I've checked "From" field and it has my Exchange account in it. I've tried to update office to SP1 - didn't help. Tried to delete OAB files and resync address book - didn't help. Tried to recreate Outlook profile - didn't help. Ive tried support.microsoft.com/kb/2546733 and support.microsoft.com/kb/2518195 and it didnt help :D

There are two workarounds:

1. From "From" field re-choose :) my account and send email.

2. Save email in my Drafts (or any other) folder.

Does anyone have solution to this issue?

I would appreciate any help :)

Thanks!

Alesandro 

Hi,

As you said, there is no one has the Send On Behalf and Send As permission for sending message from Mailbox A. The Mailbox is only used for e-mails sharing. The error message has shown the correct information that the message will not be sent due to no permission. Can you describe the requirement more detail?

Best regards,

Hi Rex,

I appreciate your reply, thanks!

I have example:

1. I create email, save it and move it to Mailbox A.

2. I open previously saved email from Mailbox A, I check field "From" and there is my name in it (not Mailbox A!)

3. I click Send and get mentioned error.

Even if my name is in From field Outlook 2010 still "thinks" that I'm trying to send email on behalf of Mailbox A. Workaround is to reselect my name from "From" drop down menu.

Thanks,

With kind regards,

Alesandro