Working with SMTP, IMAP4, and POP3 Virtual ServersMastering Core SMTP, IMAP4, and POP3 AdministrationStarting, Stopping, and Pausing Virtual ServersConfiguring Ports and IP Addresses Used by Virtual ServersControlling Incoming Connections to Virtual ServersSecuring Access by IP Address, Subnet, or DomainControlling Secure Communications for Incoming ConnectionsRestricting Incoming Connections and Setting Time-Out ValuesViewing and Ending User SessionsManaging SMTP Virtual ServersCreating SMTP Virtual ServersManaging Message Delivery for SMTP and the Exchange Server OrganizationSetting Outbound Retry Intervals, Delay Notification, and Expiration Time-OutSetting the Message Hop CountSetting Domain Name OptionsConfiguring Reverse Lookups and External DNS ServersControlling Authentication for Incoming SMTP ConnectionsConfiguring Outbound SecurityConfiguring Outgoing ConnectionsManaging Messaging Limits for SMTPHandling Nondelivery, Bad Mail, and Unresolved RecipientsSetting and Removing Relay RestrictionsManaging IMAP4Creating IMAP4 Virtual ServersControlling Authentication for Incoming IMAP4 ConnectionsAllowing Public Folder Requests and Fast Message RetrievalSetting Message FormatsManaging POP3Creating POP3 Virtual ServersControlling Authentication for Incoming POP3 ConnectionsSetting Message Formats