TAILIEUCHUNG - Exxhange SQL And IIS- P89

Exxhange SQL And IIS- P89:The following legacy Exchange features have been de-emphasized in Exchange Server 2007. What does that mean? It means that these features are still included in the Exchange product, but they’re not prioritized anymore, and will most likely disappear in the next Exchange release after Exchange Server 2007 | Managing the Edge Transport Server Chapter 7 417 An RBL is an Internet-based service that tracks systems and then adds those systems IP addresses to a public list that are known to send or suspected of sending out spam. Note You can read more about what RBLs are as well as how they work at http en. wiki DNSBL. In addition you can find a list of the most popular RBLs at . In addition to specifying IP Block list providers you can also enter a custom error message that should be returned to the blocked SMTP server. Last but not least there s an Exceptions tab where you can specify IP addresses to which e-mail messages shouldn t be blocked regardless of the feedback from the RBL. Sender Filtering When the Connection Filtering agent has processed the SMTP connection the next filtering agent involved is Sender Filtering which will check the e-mail address of the sender against the list of e-mail addresses or domains you have specified under the Sender Filtering Properties page see Figure . The Sender Filtering agent lets you reject individual e-mail addresses single domains or whole blocks of domains that is a domain and any subdomains . When the Sender Filtering agent rejects an e-mail message a 554 Sender Denied message is returned to the sending server. The agent also lets you reject any e-mail messages that don t contain a sender. In addition to rejecting e-mail address and or domains specified on the Blocked Senders list on the Sender Filtering Properties page you can also choose to stamp messages instead of rejecting them done under the Action tab . When you choose this action the metadata of the message will be updated to indicate that the message was sent by a blocked sender. The stamp will then be used when the Content Filtering agent calculates the spam confidence level SCL of the message. Bear in mind that the Sender Filtering agent overrides the Outlook Safe Senders list which we will talk .

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