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If your server is a CAS server then there is no simple way to automatically forward incoming email to different server.<br />
You can create rule on each mailbox and forward email to outside using let say contacts but you must create that many contacts as many users you have and create rule under each mailbox but email address on other server (maligun) needs to be different from your local email address on Exchange.<br />
Or you need to use some 3rd party tool to grab email from Exchange, I remember GFI software has some SMTP connector to grab emails from Exchange or other SMTP and put if in different server but it was long time ago.<br />
Automatic forward is not possible and my question is why you want to do it ? If you want all emails go to maligun just change MX record in your DNS and point it to maligun.
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<a href="https://AuthSMTP.com" rel="ugc"><u>https://AuthSMTP.com</u></a> seems similar to MailGun.<br />
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Two primary differences stand out.<br />
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1) MailGun allows you to send 10,000 email free each month. AuthSMTP charges $176.00 for first 10,000 email each month.<br />
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2) MailGun likely allows far better per message debugging, when problems arise. AuthSMTP isn't really clear what type of per message debugging they provide.<br />
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Be sure to keep MailGun on your list of services to test for low volume sites or sites with low ROI, where free email is useful.
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How do I integrate mailgun with my Exchange 2016 Server?<br />
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My mailgun setup is complete and verified. Just need to get my Exchange mail to pass through mailgun.
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How do I integrate mailgun with my Exchange 2016 Server?

My mailgun setup is complete and verified. Just need to get my Exchange mail to pass through mailgun.

How do I integrate mailgun with my Exchange 2016 Server?

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.

Email Servers

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.