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Please check your receive connector and enable anonymous access on receive connector to receive mails. please refer below article<br />
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<a href="http://www.techieshelp.com/setup-exchange-2013-receive-connector/" rel="ugc">http://www.techieshelp.com/setup-exchange-2013-receive-connector/</a><br />
<br />
<a href="http://www.mustbegeek.com/configure-exchange-server-2013-to-send-and-receive-outside-email/" rel="ugc">http://www.mustbegeek.com/configure-exchange-server-2013-to-send-and-receive-outside-email/</a>
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Please check your receive connector and enable anonymous access on receive connector to receive mails. please refer below article

http://www.techieshelp.com/setup-exchange-2013-receive-connector/ [http://www.techieshelp.com/setup-exchange-2013-receive-connector/]

http://www.mustbegeek.com/configure-exchange-server-2013-to-send-and-receive-outside-email/ [http://www.mustbegeek.com/configure-exchange-server-2013-to-send-and-receive-outside-email/]

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What is the exchange version?
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I checked my receive connectors and they have anonymous access. It may have something to do with my Email appliance not forwarding to the correct server since I migrated over. I'm checking that now.
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I checked my receive connectors and they have anonymous access. It may have something to do with my Email appliance not forwarding to the correct server since I migrated over. I'm checking that now.

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Appliance problem. Not exchange.
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I'm getting this error and can not receive email from anywhere.<br />
However I can send email OK. Its the receiving part.
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I'm getting this error and can not receive email from anywhere.
However I can send email OK. Its the receiving part.

550 5.7.1 Unable to relay for

A server is a computer program or a machine that waits for requests from other machines or software (clients) and responds to them. This architecture is called the client–server model. The clients may run on the same computer or may connect to the server over a network. The purpose of a server is to share data or hardware and software resources among clients. Typical computing servers are database servers, file servers, mail servers, print servers, web servers, game servers, and application servers.

Server Software

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

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.