Shared Mailboxes in Exchange 2010 - Internal emails

Recently i posted a Q about shared mailboxes - yesterday was able to successfully setup 4 different shared mailboxes using Exchange Powershell. Configured full access permissions for the appropriate users and all seemed to be ok but users today have advised me that they can't email those shared mailboxes internally. They get a bounce back message straightaway saying 'the email address you entered can't be found'
External emails are fine.

I'm guessing I haven't configured something else as well?
PowersMackayAsked:
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ssk_2k3Connect With a Mentor Commented:
There may be few reasons :

* Outlook email address auto complete might caused this error.so did the user tried to type the email address manually and tried to send the email?or pickup that email address from GAL should help.

*User properties - Email address (@exch.domain.com and primary SMTP address) been setup corectly?

* if the above steps are valid worth to try with reconfiguring the outlook profile.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I guess its their cached issue .... check with OWA\Webmail once please

- Rancy
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PowersMackayAuthor Commented:
It was found to be related to the auto type of email address in the 'To' field - we advised clients to select the mailboxes from the 'To' field and input address from there. Many thanks ssk_2k3
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