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This would be apt. Apt requires an MTA because maintainer messages / change-lists are sent as mail to the root user.

• stevekemp 10y ago
  Close. It is cron that requires a package which provides `mail-transport-agent`, because output from cronjobs is traditionally emailed to users. You can see this via: apt-cache show cron|grep -i mail Note that the `apt` package itself does not require a MTA.