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do you have permissions (anonomous) enabled on default receive connector? are users mailboxes on 2010?
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do you have permissions (anonomous) enabled on default receive connector? are users mailboxes on 2010?

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I setup a new exchange 2010 server and the users can get email inside, but when you try to send an email to them from the outside, the get bounced back with a communication failure or deleivery has failed.
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I setup a new exchange 2010 server and the users can get email inside, but when you try to send an email to them from the outside, the get bounced back with a communication failure or deleivery has failed.

Exchange 2010 users cant get outside email

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.