An additional lookup configuration option is available in the SMTP connector properties. Depending on your lookup configuration, this option must be enabled or disabled for the SMTP connector to perform lookups successfully.
To configure the lookup settings for the SMTP connector
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Start the Server Administrator.
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Expand the Server Administrator tree.
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Select Connectors. The Connectors details pane lists the connectors that are licensed with your server.
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Double-click the SMTP connector to open the Properties dialog box.
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Click DID/DTMF Lookup.
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Click Add. The LDAP Properties dialog box opens and shows the Connection dialog box.
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In the Logon section,
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If User is selected, look at the Username field. If this field contains a user ID formatted using the Active Directory logon format (for example, username@server.forest.domain.com), lookups in this search base should be successful with no additional configuration. If this field contains a user ID in any other format (for example, domain\user), select Bind using Windows generic security services.
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If Anonymous is selected, no additional configuration is required for this search base.
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Click OK twice to save the lookup configuration.
See also
Sending SMTP Connector Outbound Messages
Configuring SMTP Connector DID/DTMF Lookup
SMTP Connector One-off Address Format
Configuring SMTP Connector Default Recipient Type and Outbound Rules