How can i Configure SMTP on Exchange 2010

Hi Dear , i have 3 Server Exchange 2010 , one CAS one Mailbox Rolls and One Edge Server .

Now every thing ok , Just i have This Question how Can i Enable SMTP/POP3 to Exchange 2010 for my Client can access them Outlook from Internet .

i  Also Enable Pop3 Service on CAS , But when i configure my Information on my Outlook i saw Error JUST ON Receive and Send Was Success .

Here is Receive Error : Log onto incoming mail server (POP3): Your e-mail server rejected your user name. Verify your user name for this account in Account Settings.  The server responded: -ERR Command is not valid in this state.

Thanks .
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check this tutorial with screenshot.
Sikhumbuzo NtsadaSenior IT TechnicianCommented:
Check this one too:
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iMehranAuthor Commented:
Thanks for your reply but its for OWA Config , My SMTP Have issue .

Thanks ...
iMehranAuthor Commented:
Thank you so much , i did These Steps . but after i click send and receive i saw this Error on Receive .

iMehranAuthor Commented:
there is no idea ?!
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