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If your mail server is behind firewall, create firewall rule to only accept SMTP &nbsp;(port 25) traffic only from Message Labs servers' public ip address. You should can get the ip address list from contacting message labs support.
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If your mail server is behind firewall, create firewall rule to only accept SMTP  (port 25) traffic only from Message Labs servers' public ip address. You should can get the ip address list from contacting message labs support.

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I have an exchange server 2010 and I need to 'lock down' the server.<br />
&nbsp;I am using message labs as my spam filter but spam emails are still getting<br />
through by sending directly to the server and not following the MX record which<br />
points to Message Labs.
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I have an exchange server 2010 and I need to 'lock down' the server.
 I am using message labs as my spam filter but spam emails are still getting
through by sending directly to the server and not following the MX record which
points to Message Labs.

How do I lock down my exchange server 2010

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.