sudo pico /System/Library/StartupItems/Sendmail/Sendmail

Find this line near the end:

/usr/sbin/sendmail -bd -q1h

And add this line after it:

/usr/sbin/sendmail -C /etc/mail/submit.cf -q1h

Save that file and restart your machine to allow the startup script to run."

Thus generating the following Sendmail file

---[Cut Here]---

#!/bin/sh

. /etc/rc.common

##
# Start mail server
##

if [ "${MAILSERVER:=-NO-}" = "-YES-" ]; then

ConsoleMessage "Starting mail services"

##
# Remove junk from the outbound mail queue directory and start up
# the sendmail daemon. /usr/spool/mqueue is assumed here even though
# it can be changed in the sendmail configuration file.
##
queue=/var/spool/mqueue
rm -f ${queue}/nf* ${queue}/lf*

/usr/sbin/sendmail -bd -q1h
/usr/sbin/sendmail -C /etc/mail/submit.cf -q1h

fi

---[Cut Here]---

Presumabably, you only wanted us to ADD to that line. Thereby generating the following Sendmail file

---[Cut Here]---

#!/bin/sh

. /etc/rc.common

##
# Start mail server
##

if [ "${MAILSERVER:=-NO-}" = "-YES-" ]; then

ConsoleMessage "Starting mail services"

##
# Remove junk from the outbound mail queue directory and start up
# the sendmail daemon. /usr/spool/mqueue is assumed here even though
# it can be changed in the sendmail configuration file.
##
queue=/var/spool/mqueue
rm -f ${queue}/nf* ${queue}/lf*

/usr/sbin/sendmail -C /etc/mail/submit.cf -q1h

fi

---[Cut Here]---

Please clarify and or change your article to correctly reflect your intent.

Also, why are you not appending a & to the line in question, thereby making sendmail a backgournd app, as it should be?