FreeBSD 上禁用 Sendmail 进程开机启动

添加到 /etc/rc.conf：

sendmail_enable="NO"
sendmail_submit_enable="NO"
sendmail_outbound_enable="NO"
sendmail_msp_queue_enable="NO"

参考： https://github.com/freebsd/freebsd-src/commit/d87e0e8e230495df3be59a8a5c173aafc83bc450