If your system doesn't have sendmail, it's probably got some
other MTA which could possibly emulate sendmail's "-t" option.
If you are wanting to send mail to another SMTP server aside
from localhost, you are going to have to talk the SMTP protocol
in your script, or write a script to act like sendmail -t,
and pass the message off to it.
The best solution really depends on your situation; what
platform are you dealing with, and what are your choices
for sending mail locally? Sending through a remote SMTP
server would be my last choice.
