You are the messaging engineer for your company. Your company has an Exchange Server 2007 messaging system.

The perimeter network contains an Edge Transport server. The Edge Transport server has content filtering enabled.

You need to recommend additional anti-spam configurations that meet the following requirements:

Reject connections from Internet addresses that are from known sources of spam.

Maintain the Internet addresses that are from known sources of spam by using an external service.

Reject e-mail from Internet addresses that are possible sources of spam by running SMTP open proxy tests.

Which two configurations should you recommend? (Each correct answer presents part of the solution.

Choose two.)