Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Before trying to restart/stop the MTA or MSP queue runner, make sure
we are configured to use an MTA or MSP queue runner. Otherwise the
script used to complain about the missing PID file.

PR: conf/57075
Submitted by: Jonathan Chen <jonc@chen.org.nz>
MFC after: 2 weeks

This file was removed prematurely. It contains functionality
not currently duplicated by rcNG, and is also relied on by
/etc/mail/Makefile.

Submitted by: hrs
Pointy hat to: me