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+Deliver delivers E-Mail on the local system.
+
+Deliver allows any user to write a shell script that processes all
+incoming mail messages for that user. The system administrator may
+also install scripts that process all messages.
+
+The output of a script is a list of mail addresses, files and programs
+that should receive the message. It has access to each message as it
+is processed, so the action can be content dependent. The script may
+also generate automatic replies, like the "vacation" program, or pass
+along a modified version of the original message.
+
+Deliver can be used to construct mail-based services (e.g. automatic
+mailing list maintenance). It can also be used to filter mail
+automatically in prearranged ways (e.g. encryption and decryption,
+tossing junk mail, or vacation notices).
+
+Although deliver works best when installed set-user-id root, it can
+perform many of its functions even when installed in the private bin
+directory of a regular user.