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techzter is right. &nbsp;that is a best practice and if you have some logging on your firewall then you can see what machines are trying to broadcast out spam on port 25.
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techzter is right.  that is a best practice and if you have some logging on your firewall then you can see what machines are trying to broadcast out spam on port 25.

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Sorry for the duplicate info shadow. I was typing while you posted.
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Sorry for the duplicate info shadow. I was typing while you posted.

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We suspect one of our client computers inside our LAN is SOMETIMES sending out spam emails. From time to time we have external users (such as auditors, sales persons, staff members from our other divisions) connecting to our LAN. Instead of virus-scanning one by one, I want to know if there is any way (like monitoring tools) to tell which computer is sending spam emails. &nbsp; 
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We suspect one of our client computers inside our LAN is SOMETIMES sending out spam emails. From time to time we have external users (such as auditors, sales persons, staff members from our other divisions) connecting to our LAN. Instead of virus-scanning one by one, I want to know if there is any way (like monitoring tools) to tell which computer is sending spam emails.   

How to tell which client computer inside my LAN is sending out spam emails?

Anti-virus software was originally developed to detect and remove computer viruses. However, with the proliferation of other kinds of malware, antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious layered service providers (LSPs), dialers, fraud tools, adware and spyware. Some products also include protection from other computer threats, such as infected and malicious URLs, spam, scam and phishing attacks, online identity theft (privacy), online banking attacks, social engineering techniques, Advanced Persistent Threat (APT), botnets and DDoS attacks.

Anti-Virus Apps

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.