I think it's best to have an example. "cron" seems to be an ideal one, though I'd be happy to add a second, Windows-specific, example if there is one. If not, changing 'such as "cron"' to 'such as the "cron" UNIX utility' seems a better change to me.
Anyone who's ever managed a Unix or linux system knows what cron is. It's a fine example.
Indeed, on my own servers, there are cron scripts that push out daily digests which are DKIM signed on the way out.
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