#!/usr/bin/ksh
MAILADDRTO="first@someplace.com,second@someplace.com"
MAILADDRFR=email@mail.com
(sleep 5
echo EHLO
sleep 5
echo MAIL FROM: $MAILADDRFR
sleep 5
echo RCPT TO: $MAILADDRTO
sleep 5
echo DATA
sleep 5
echo From: $MAILADDRFR
echo To: $MAILADDRTO
echo subject: PBS Check File Created
echo
echo The PBS check file is available for download
echo
sleep 5
echo .
sleep 5
echo QUIT
sleep 5) | telnet 00.00.00.00 25

...
for rcpt in `echo $MAILADDRTO | sed 's/,/ /g'`
do
  echo RCPT TO: $rcpt
  sleep 5
done
...