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Changes in version 2.5

- Replaced most of the defines with run-time config files.  See the man
  page for relay-ctrl-age for more details.

- Removed check for standard input and standard output being sockets to
  allow relay-ctrl-allow to be used with SSL pipes.

- Check for the "::ffff:" IPv6 address prefix before validating address.

- Rules defined in the rules file now override the generated rules,
  instead of vice versa.
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Changes in version 2.0

- Now supports Courier IMAP as well as qmail-popup/qmail-pop3d.
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