The sendmail daemon can be in a state where it is rejecting new messages and sets the proc title accordingly. The current rc.d script ignores sendmail if it is in this state.
$ pgrep -lf sendmail 459 sendmail: rejecting new messages: min free: 100 I don't believe the wildcard following '(accepting|rejecting)' is really needed either, but left it in. Index: sendmail =================================================================== RCS file: /home/danh/.cvs/openbsd/src/etc/rc.d/sendmail,v retrieving revision 1.4 diff -u -p -r1.4 sendmail --- sendmail 12 Jul 2011 05:40:55 -0000 1.4 +++ sendmail 17 Jan 2012 11:59:54 -0000 @@ -6,7 +6,7 @@ daemon="/usr/sbin/sendmail" . /etc/rc.d/rc.subr -pexp="(sendmail: accepting.*|${daemon}* -(q[0-9]|bd)*)" +pexp="(sendmail: (accepting|rejecting).*|${daemon}* -(q[0-9]|bd)*)" rc_bg=YES