Problem with POP3 and Exchange 2010

Arabsoft_AD used Ask the Experts™
Dear all,

I upgrade my exchange 2007 environment to exchange 2010, exchange 2007 is decommissioning now.
We are facing a problem now with POP 3 users using outlook express or Microsoft outlook; the users are able to receive emails from inside or outside. But when they try to send email, the attached error appears.
How I can solve this?

Thanks  Error while sending
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if your sending out through exchange you probably have either create or check your send connector and verify the settings are there/correct.
Solutions Architect
you need to configure the outlook to authenticate to the Exchange and configure the receive connector to allow the relay:

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