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+DRAC is a daemon that dynamically updates a relay authorization map for
+sendmail. It provides a way to allow legitimate users to relay mail through an
+SMTP server, while still preventing others from using it as a spam relay.
+User's IP addresses are added to the map immediately after they have
+authenticated to the POP or IMAP server. By default, map entries expire after
+30 minutes, but can be renewed by additional authentication. Periodically
+checking mail on a POP server is sufficient to do this. The POP and SMTP
+servers can be on different hosts.