Mine

:0 Whc: vacation.lock
* $^To:.*\<$\LOGNAME\>
* !^FROM_DAEMON
* !^X-Loop: jstuempfig@drjays.com
| formail -rD 8192 $HOME/vacation.cache

# Only run this rule if the last rule didn't match, meaning it will only mail each
# user once.
:0 ehc         # if the name was not in the cache
| (formail -rA"Precedence: junk" \
   -A"X-Loop: jstuempfig@drjays.com" ; \
   cat $HOME/.vacation.message; \
   ) | /usr/sbin/sendmail -oi -t