Inspecting the E-mail traffic of a Windows Server 2008 R2 [closed]

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http://serverfault.com – I have seen that the IP address of my mail server has added to blocked IP address list on http://psbl.org. I am using this server for personal use. So, it is not that much of an issue that I am, as a non IT pro, handling the server. I suspect that someone obtained the password of one of the e-mail addresses or my server got infected by a spamware. I am trying to find out if there is any sign of a spamware inside the server by using SysInternals' tools but I haven't seen anything unusual (or I don't know where and what to look). Is there any way I can inspect the SMTP traffic of my mail serve ()