Protocol Analysis agent

The underlying agent that is used by the Sender Reputation feature in Exchange Server 2007. The Protocol Analysis agent performs reverses DNS lookups on the sender IP address, performs Simple Mail Transfer Protocol (SMTP) HELO analysis, and may perform open proxy tests on the sender IP address. The Protocol Analysis agent uses this data and input from the Content Filter agent to compute a sender reputation level (SRL) for senders. [Exchange 2007]