Hotfix for courier-mta on Ubuntu 16.04

On Ubuntu 16.04 the installation of the Courier MTA package fails  with the following error message:

courier-mta.service is not a native service, redirecting to systemd-sysv-install
Executing /lib/systemd/systemd-sysv-install enable courier-mta
insserv: script courier-mta: service courier-mta already provided!
insserv: exiting now!

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