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IMAP on Exchange 2010 not working with Smartphones

We have an Exch 2010 server running and want to get IMAP working for smartphone users as well as external Outlook users.  Will purchase a SSL Cert so, we can use Activesync in the future.  Outlook is working fine with IMAP and smartphones can receive mail, but outgoing is not working.
Was hoping to setup with authentication but when I configure the phone to require sign-in it says the server does not support authentication.  Will accept without authentication however will not send.  Using port 587 as configured in the Client Receive Connector.

Exchange server "Client Receive Connector" has everything checked under Authentication except:
Mutual Domain Security
Externally Secure
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Simon Butler (Sembee)ConsultantCommented:
It should work out of the box, but you must put in specific credentials, in the format of domain\username. Setting it to use the same credentials as incoming doesn't work usually.

Although you should really go to ActiveSync immediately - IMAP/POP is not very good to mobile batteries.

Simon.
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WebccAuthor Commented:
Already tried that to no avail.
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Simon Butler (Sembee)ConsultantCommented:
The settings you have on the Receive Connector are not the default.
Change it back to the default to begin with.

Going from top to bottom
Check, uncheck, check, check, unchecked, checked, unchecked.

On the Permissions Groups tab, on Exchange Users should be enabled. Restart the Transport Service after changing it.

Have you checked through Outlook to confirm it works?

Simon.
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