fcron can send e-mails to the user when something happens, if this has been activated at configure time. Current fcron ebuilds enable this feature without a choice from the user. Just like sudo, this behaviour shoud be controlled by the USE flag "sendmail." One can edit fcron.conf to give an invalid pointer to sendmail so that fcron won't succeed in sending e-mails, but it's just cleaner if one can do it through USE flags, given that there is at least another ebuild that supports it. Reproducible: Always
There are some relevant comments on bug #484630.
+ 30 Sep 2013; Rick Farina <zerochaos@gentoo.org> fcron-3.1.2-r2.ebuild, + metadata.xml: + add optional mta support, fixes build failure bug 484630 and related bug + 481600 Added USE=mta (defaults to on)