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Using multiple exchange mailboxes in outlook 2010

evanstest
evanstest asked
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Last Modified: 2012-05-11
Hi
I am using Microsoft Exchange online through the Business Productivity Online Services suite.

I have outlook 2010 installed on my PC.

I need to access several microsoft exchange email boxes through the single outlook 2010 profile.  I have followed instructions found on the web to configure additional exchange email accounts using the control panel mail account.  These configurations seem to complete ok with the new exchange mailboxes being automatically found, etc.

Now, when I go back to outlook, I can receive email on all three exchange email accounts as expected.  The problem comes when I try to send or reply to an email from one of the email accounts that is not set as default.

When I do this I get an undeliverable mail message with error:

You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission.

Can someone advise how I need to configure exchange online and/or outlook such that I can send and receive from each of the three exchange email accounts?

Thanks in advance.
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