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He may be meaning that all client computer on your network are able to also send mail via port 25. You would want to make sure that the only IP able to send email via SMTP is you email server. This will help with malware or Virus that might infect other machines and use client to send mail.<br />
But you will neeed to ask him to verify what he meant.<br />

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You may need to check if you are an open relay.<br />
Yuo can control the IP addresses that are allowed to send mail through your server to ensure that any device on your network cant just send mail.
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Thanks for writing back. How can I check to ensure that our email server is the only one that can send via the smtp port? <br />

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 &nbsp; &nbsp; &nbsp; &nbsp; 21 &nbsp; ftp &nbsp; &nbsp;Success &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;140 ms<br />
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;25 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;smtp &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Success &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;140 ms<br />
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;80 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;http &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Success &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;140 ms<br />
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;443 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;https &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Success &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;125 ms<br />
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This was for the router IP that we use to send out emails. How does that look? The above are all open ports. Everything else was closed. 
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Can this be checked by changing to another router gateway and doing a telnet command?
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guys, a consultant did some work on our site and concluded that our smtp port was not secure. What does he mean? The port on the router is open fo port 25, so that mail can leave. How do I secure smtp?<br />
<br />
We're using Exchange 2007. <br />
thanks a lot<br />
Yash
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guys, a consultant did some work on our site and concluded that our smtp port was not secure. What does he mean? The port on the router is open fo port 25, so that mail can leave. How do I secure smtp?

We're using Exchange 2007. 
thanks a lot
Yash

Securing smtp port?

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

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.