Start chrony earlier so it can step the clock without effecting other daemons, e.g., postfix.
Before:
/etc/rc.d/yppasswdd
/etc/rc.d/LOGIN
/usr/local/etc/rc.d/postfix
/usr/local/etc/rc.d/chronyd
/etc/rc.d/zfsd
/etc/rc.d/ypxfrd
After:
/etc/rc.d/utx
/etc/rc.d/yppasswdd
/usr/local/etc/rc.d/chronyd
/etc/rc.d/LOGIN
/usr/local/etc/rc.d/postfix
/etc/rc.d/zfsd
/etc/rc.d/ypxfrd