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We are running Exchange Server 2013 in house and we are trying to send and receive our external through this server. &nbsp;We have an MX record pointing to our Exchange Server and an A Record pointing to our Static IP Address. We are having issues with AOL and some SPAM servers bouncing our email. Any suggestions as to what I am doing wrong would be greatly appreciated.
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We are running Exchange Server 2013 in house and we are trying to send and receive our external through this server.  We have an MX record pointing to our Exchange Server and an A Record pointing to our Static IP Address. We are having issues with AOL and some SPAM servers bouncing our email. Any suggestions as to what I am doing wrong would be greatly appreciated.

Sending external email through Exchange 2013

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.

Exchange

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.