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This is due to the fact that you have allowed the IP ranges to relay. &nbsp;If you remove the IP addresses from the relay list, it will only relay to local domain only.
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This is due to the fact that you have allowed the IP ranges to relay.  If you remove the IP addresses from the relay list, it will only relay to local domain only.

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Unfortunately, I don't have my own exchange server, but instead use Office365. &nbsp;Because of this, I must allow the traffic to leave the company intranet.<br />
<br />
Is there another way to make this work?
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Unfortunately, I don't have my own exchange server, but instead use Office365.  Because of this, I must allow the traffic to leave the company intranet.

Is there another way to make this work?

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<div class="content wysiwyg-content">
I'd like to take my existing SMTP server that is within my network, and limit where it can send emails. I only want emails to go out to addresses that are within my domain.<br />
<br />
Currently, anyone with access to the server can send to any email in the world. Moving forward I only want emails to go to user@mydomain.com. All other emails should be ignored.<br />
<br />
I'm currently using Windows server 2012 with Microsoft's SMTP module.<br />
<br />
Is there a way to set this up with my current solution or is there another product that will cover this?<br />
<br />
All help is appreciated.<br />
<br />
Thank you,<br />
<br />
John Caspary
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I'd like to take my existing SMTP server that is within my network, and limit where it can send emails. I only want emails to go out to addresses that are within my domain.

Currently, anyone with access to the server can send to any email in the world. Moving forward I only want emails to go to user@mydomain.com. All other emails should be ignored.

I'm currently using Windows server 2012 with Microsoft's SMTP module.

Is there a way to set this up with my current solution or is there another product that will cover this?

All help is appreciated.

Thank you,

John Caspary

SMTP Server send only within my domain

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

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

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.