Something

#!/usr/pkg/bin/bash

alertRecipient="tacacs@correoargentino.com.ar"
#TMOUT=1

while :
do
while read line
do
 [...]
  echo ${line} | grep "message repeated" > /dev/null 2>&1
  if test $? -eq 1
  then
      echo "${line}" | mailx -s "Radware Log" ${alertRecipient}
  fi
done
done