Notable changes since v4.0.0-rc.1:

Breaking changes

• ddclient now looks for ddclient.conf in ${sysconfdir}/ddclient by default instead of ${sysconfdir}. #789

  To retain the previous behavior, pass '--with-confdir=${sysconfdir}' to configure. For example:

  ```shell

  Before v4.0.0:

  ./configure --sysconfdir=/etc

  Equivalent with v4.0.0 and later (the single quotes are intentional):

  ./configure --sysconfdir=/etc --with-confdir='${sysconfdir}' ```

  or:

  ```shell

  Before v4.0.0:

  ./configure --sysconfdir=/etc/ddclient

  Equivalent with v4.0.0 and later:

  ./configure --sysconfdir=/etc ```

New features

• New --mail-from option to control the "From:" header of email messages. #565