utility is a wrapper script for using stunnel.
This command is necessary for the mew-ssl feature to keep a process of stunnel.
The options are for stunnel4 or stunnel.
If stunnel4 is installed, it is executed.
If stunnel4 is not installed, stunnel is executed.
If the MEW_PROG_STUNNEL environment variable is set, it is executed instead.
This command is provided by Debian.
This command is not integrated in the upstream source.