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The lookups restrict the accepted email addresses for the selected domain for incoming mail. This can be based on the domain address list and/or LDAP lookups.
Address list: Use the domain address list to allow email addresses for incoming mail.
LDAP Connectors: Selecting an LDAP lookup you have previously configured on LDAP Lookups tab to allow email addresses for this domain.
You must click "Update" to apply the settings.