IronPort - advanced configuration guide

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3-48 1 Step 2 From the LDAP server profile, configure the following settings: 3 Number Description 1 List LDAP Servers 2 Configure Maximum Connections 3 Select Load Balancing Mode Step 3 Configure other LDAP settings and commit the changes. Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide 2 Chapter 3 LDAP Queries OL-25137-01
OL-25137-01 CHAPTER 4 Validating Recipients Using an SMTP Server This chapter explains how to validate recipients using an SMTP server. This chapter contains the following sections: SMTP Call-Ahead Recipient Validation: Overview, page 4-1 Configuring SMTP Call-Ahead Recipient Validation, page 4-3 Enabling the SMTP Call-Ahead Server Profile on a Public Listener, page 4-6 Configuring LDAP Routing Query Settings, page 4-7 SMTP Call-Ahead Query Routing, page 4-8 Bypassing SMTP Call-Ahead Validation, page 4-9 SMTP Call-Ahead Recipient Validation: Overview SMTP call-ahead recipient validation allows you to perform recipient validation by querying an external SMTP server prior to accepting incoming mail for the recipient. SMTP call-ahead recipient validation is useful in cases where you might want to validate users but cannot use LDAP Accept or the Recipient Access Table (RAT) for recipient validation. For example, a customer hosts mail for a large number of different mailboxes, each using a separate domain. Because of the LDAP infrastructure, there is no way to query the infrastructure to validate each of the customers in their separate domains. In this case, the customer could set up SMTP call-ahead recipient validation to allow the Email Security appliance to query the SMTP server and validate the recipient before continuing the SMTP conversation. SMTP call-ahead recipient validation allows the Email Security appliance to save a significant amount of processing on messages for invalid recipients. In normal processing, a message for an invalid recipient must be processed through the work queue phases of the email pipeline before it can be dropped. Using the SMTP call-ahead recipient validation feature, an invalid message can be dropped or bounced during the incoming/receiving part of the email pipeline without requiring additional processing. When you configure your Email Security appliance for SMTP call-ahead recipient validation, the Email Security appliance suspends the SMTP conversation with the sending MTA while it “calls ahead” to the SMTP server to verify the recipient. When the Cisco IronPort appliance queries the SMTP server, it returns the SMTP server’s response to the Email Security appliance, and depending on the settings you have configured, you can accept the mail or drop the connection with a code and custom response. Figure 4-1 shows the basic workflow of the SMTP call-head validation conversation. Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide 4-1
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OL-25137-01 AsyncOS Quick Reference
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Appendix A AsyncOS Quick Reference
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FTP Access OL-25137-01 Accessing th
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Appendix B Accessing the Appliance
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